Isosceles - GCSE Maths Definition

An isosceles triangle is a type of triangle that has two sides of equal length. Because these two sides are the same, the angles opposite them are also equal. This means that if you know the length of the two equal sides or the size of one of these equal angles, you can often work out other properties of the triangle.

Isosceles triangles are useful in geometry because of their symmetrical properties, which can make solving problems or proving theorems easier. Understanding isosceles triangles helps you explore more complex concepts in geometry as part of your GCSE Maths course.