An isosceles triangle therefore has both two equal sides and two equal angles. The name derives from the Greek iso (same) and skelos (leg). A triangle with all sides equal is called an equilateral triangle, and a triangle with no sides equal is called a scalene triangle.

Which angles are equal in an isosceles triangle?

The angles that involve the base of an isosceles triangle are known as the 'base angles. ' The angles situated opposite to the equal sides of an isosceles triangle are always equal. All the three angles situated within the isosceles triangle are acute, which signifies that the angles are less than 90°.

Why do isosceles triangles have two equal angles?

In isosceles triangles the angles at the base are equal to one another, and, if the equal straight lines be produced further, the angles under the base will be equal to each other.