An isosceles triangle is a triangle with two sides of equal length , and the angles opposite those equal sides are also equal.

Quick Scoop

  • It’s a 3‑sided shape (a triangle) where at least two sides match in length.
  • The equal sides are often called the legs , and the third side is called the base.
  • The two angles opposite the equal sides (the “base angles”) have the same measure.
  • A line dropped from the top vertex to the base (the altitude) cuts the triangle into two mirror‑image right triangles, acting like a line of symmetry.

Simple example

Imagine a triangle where two sides are 5 cm and the base is 8 cm.
Because the two 5 cm sides are equal, it’s an isosceles triangle, and the two base angles will be equal as well.

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