Similar Triangles: A Comprehensive Guide

5/3/2026

6 min read

Similar triangles are triangles with the same shape but not necessarily the same size. They have the same angles and their corresponding sides are in proportion.

Explanation

Similar triangles can be used to solve problems in geometry and trigonometry. They are also used in real-world applications such as architecture and engineering.

Formula

a/b = c/d

Example

If two triangles have side lengths 3, 4, 5 and 6, 8, 10, they are similar.

How to use the related calculator

To use this tool, simply enter the side lengths of the two triangles and click calculate. The tool will then tell you whether the triangles are similar or not.

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FAQ

What are similar triangles?

Triangles with the same shape but not necessarily the same size

How do I use this calculator?

Enter the side lengths of the two triangles and click calculate