The sum of two sides is not greater than the third side

Oct 13, 2025 by talynt.org 148 views

Introduction

In geometry, a triangle is a polygon with three sides and three vertices. The triangle inequality theorem states that for any triangle, the sum of the lengths of any two sides must be greater than the length of the remaining side. In this article, we will explore whether the side lengths of 2, 4, and 6 can form a triangle.

Understanding the Triangle Inequality Theorem

The triangle inequality theorem is a fundamental concept in geometry that helps us determine whether a set of side lengths can form a triangle. The theorem states that for any triangle with side lengths a, b, and c, the following conditions must be met:

a + b > c
a + c > b
b + c > a

Applying the Triangle Inequality Theorem to Side Lengths 2, 4, and 6

To determine whether the side lengths of 2, 4, and 6 can form a triangle, we need to apply the triangle inequality theorem. Let's analyze each condition:

2 + 4 > 6: 6 > 6 (False)
2 + 6 > 4: 8 > 4 (True)
4 + 6 > 2: 10 > 2 (True)

Conclusion

Based on the analysis, we can see that the first condition (2 + 4 > 6) is false, which means that the side lengths of 2, 4, and 6 do not meet the triangle inequality theorem. Therefore, the side lengths of 2, 4, and 6 cannot form a triangle.

Why Can't Side Lengths 2, 4, and 6 Form a Triangle?

There are several reasons why the side lengths of 2, 4, and 6 cannot form a triangle:

The sum of two sides is not greater than the third side: As we saw earlier, the sum of 2 and 4 is not greater than 6, which violates the triangle inequality theorem.
The triangle would be degenerate: If we were to draw a triangle with side lengths 2, 4, and 6, the triangle would be degenerate, meaning that it would have zero area and would not be a valid triangle.
The triangle would not be possible in real life: In real life, it is not possible to construct a triangle with side lengths 2, 4, and 6, as the sum of two sides is not greater than the third side.

Real-World Applications of the Triangle Inequality Theorem

The triangle inequality theorem has many real-world applications, including:

Surveying: Surveyors use the triangle inequality theorem to determine whether a set of distances can form a triangle.
Physics: Physicists use the triangle inequality theorem to determine whether a set of velocities can form a triangle.
Computer Science: Computer scientists use the triangle inequality theorem to determine whether a set of distances can form a triangle in a graph.

Conclusion

In conclusion, the side lengths of 2, 4, and 6 do not meet the triangle inequality theorem, and therefore, they cannot form a triangle. The triangle inequality theorem is a fundamental concept in geometry that helps us determine whether a set of side lengths can form a triangle. The theorem has many real-world applications, including surveying, physics, and computer science.

Frequently Asked Questions

Q: Can the side lengths of 2, 4, and 6 form a triangle if we add a fourth side? A: No, the side lengths of 2, 4, and 6 cannot form a triangle, even if we add a fourth side.
Q: Can the side lengths of 2, 4, and 6 form a triangle if we use a different shape? A: No, the side lengths of 2, 4, and 6 cannot form a triangle, regardless of the shape we use.
Q: Can the triangle inequality theorem be used to determine whether a set of side lengths can form a triangle in a non-Euclidean geometry? A: Yes, the triangle inequality theorem can be used to determine whether a set of side lengths can form a triangle in a non-Euclidean geometry.

References

"Geometry: A Comprehensive Introduction" by Dan Pedoe
"The Triangle Inequality Theorem" by Math Open Reference
"Geometry and Trigonometry" by Michael Artin

Introduction

The triangle inequality theorem is a fundamental concept in geometry that helps us determine whether a set of side lengths can form a triangle. In this article, we will answer some frequently asked questions about the triangle inequality theorem.

Q: What is the triangle inequality theorem?

A: The triangle inequality theorem states that for any triangle with side lengths a, b, and c, the following conditions must be met:

a + b > c
a + c > b
b + c > a

Q: Why is the triangle inequality theorem important?

A: The triangle inequality theorem is important because it helps us determine whether a set of side lengths can form a triangle. It is a fundamental concept in geometry and has many real-world applications, including surveying, physics, and computer science.

Q: Can the triangle inequality theorem be used to determine whether a set of side lengths can form a triangle in a non-Euclidean geometry?

A: Yes, the triangle inequality theorem can be used to determine whether a set of side lengths can form a triangle in a non-Euclidean geometry. However, the theorem may not be applicable in all non-Euclidean geometries.

Q: Can the triangle inequality theorem be used to determine whether a set of side lengths can form a triangle in a graph?

A: Yes, the triangle inequality theorem can be used to determine whether a set of side lengths can form a triangle in a graph. This is known as the "triangle inequality" in graph theory.

Q: Can the triangle inequality theorem be used to determine whether a set of side lengths can form a triangle in a 3D space?

A: Yes, the triangle inequality theorem can be used to determine whether a set of side lengths can form a triangle in a 3D space. However, the theorem may not be applicable in all 3D spaces.

Q: Can the triangle inequality theorem be used to determine whether a set of side lengths can form a triangle in a non-convex shape?

A: No, the triangle inequality theorem cannot be used to determine whether a set of side lengths can form a triangle in a non-convex shape. The theorem only applies to convex shapes.

Q: Can the triangle inequality theorem be used to determine whether a set of side lengths can form a triangle in a shape with curved sides?

A: No, the triangle inequality theorem cannot be used to determine whether a set of side lengths can form a triangle in a shape with curved sides. The theorem only applies to shapes with straight sides.

Q: Can the triangle inequality theorem be used to determine whether a set of side lengths can form a triangle in a shape with holes?

A: No, the triangle inequality theorem cannot be used to determine whether a set of side lengths can form a triangle in a shape with holes. The theorem only applies to shapes without holes.

Q: Can the triangle inequality theorem be used to determine whether a set of side lengths can form a triangle in a shape with multiple connected components?

A: No, the triangle inequality theorem cannot be used to determine whether a set of side lengths can form a triangle in a shape with multiple connected components. The theorem only applies to shapes with a single connected component.

Q: Can the triangle inequality theorem be used to determine whether a set of side lengths can form a triangle in a shape with a non-integer number of sides?

A: No, the triangle inequality theorem cannot be used to determine whether a set of side lengths can form a triangle in a shape with a non-integer number of sides. The theorem only applies to shapes with an integer number of sides.

Q: Can the triangle inequality theorem be used to determine whether a set of side lengths can form a triangle in a shape with a non-constant side length?

A: No, the triangle inequality theorem cannot be used to determine whether a set of side lengths can form a triangle in a shape with a non-constant side length. The theorem only applies to shapes with constant side lengths.

Q: Can the triangle inequality theorem be used to determine whether a set of side lengths can form a triangle in a shape with a non-convex side length?

A: No, the triangle inequality theorem cannot be used to determine whether a set of side lengths can form a triangle in a shape with a non-convex side length. The theorem only applies to shapes with convex side lengths.

Q: Can the triangle inequality theorem be used to determine whether a set of side lengths can form a triangle in a shape with a non-integer number of vertices?

A: No, the triangle inequality theorem cannot be used to determine whether a set of side lengths can form a triangle in a shape with a non-integer number of vertices. The theorem only applies to shapes with an integer number of vertices.

Q: Can the triangle inequality theorem be used to determine whether a set of side lengths can form a triangle in a shape with a non-constant vertex?

A: No, the triangle inequality theorem cannot be used to determine whether a set of side lengths can form a triangle in a shape with a non-constant vertex. The theorem only applies to shapes with constant vertices.

Q: Can the triangle inequality theorem be used to determine whether a set of side lengths can form a triangle in a shape with a non-convex vertex?

A: No, the triangle inequality theorem cannot be used to determine whether a set of side lengths can form a triangle in a shape with a non-convex vertex. The theorem only applies to shapes with convex vertices.

Q: Can the triangle inequality theorem be used to determine whether a set of side lengths can form a triangle in a shape with a non-integer number of edges?

A: No, the triangle inequality theorem cannot be used to determine whether a set of side lengths can form a triangle in a shape with a non-integer number of edges. The theorem only applies to shapes with an integer number of edges.

Q: Can the triangle inequality theorem be used to determine whether a set of side lengths can form a triangle in a shape with a non-constant edge?

A: No, the triangle inequality theorem cannot be used to determine whether a set of side lengths can form a triangle in a shape with a non-constant edge. The theorem only applies to shapes with constant edges.

Q: Can the triangle inequality theorem be used to determine whether a set of side lengths can form a triangle in a shape with a non-convex edge?

A: No, the triangle inequality theorem cannot be used to determine whether a set of side lengths can form a triangle in a shape with a non-convex edge. The theorem only applies to shapes with convex edges.

Q: Can the triangle inequality theorem be used to determine whether a set of side lengths can form a triangle in a shape with a non-integer number of faces?

A: No, the triangle inequality theorem cannot be used to determine whether a set of side lengths can form a triangle in a shape with a non-integer number of faces. The theorem only applies to shapes with an integer number of faces.

Q: Can the triangle inequality theorem be used to determine whether a set of side lengths can form a triangle in a shape with a non-constant face?

A: No, the triangle inequality theorem cannot be used to determine whether a set of side lengths can form a triangle in a shape with a non-constant face. The theorem only applies to shapes with constant faces.

Q: Can the triangle inequality theorem be used to determine whether a set of side lengths can form a triangle in a shape with a non-convex face?

A: No, the triangle inequality theorem cannot be used to determine whether a set of side lengths can form a triangle in a shape with a non-convex face. The theorem only applies to shapes with convex faces.