Isosceles Triangle, Equilateral Triangle, Acute Triangle

This yield sign is an example of an isosceles triangle, an equilateral triangle, and an acute triangle.

An isosceles triangle is a triangle with at least two sides that are equal in length. This triangle has three.

An equilateral triangle is a triangle with sides that are all equal in length, and it also has equal angle measures.

An acute triangle is a triangle with three angles measuring under 90 degrees.