Isosceles Triangles

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle that has at least two sides of equal length.

Front

What is the base of an isosceles triangle?

Back

The base of an isosceles triangle is the side that is not equal in length to the other two sides.

Front

What are the properties of the angles in an isosceles triangle?

Back

The angles opposite the equal sides are also equal.

Front

How do you find the height of an isosceles triangle?

Back

The height can be found by drawing a perpendicular line from the vertex opposite the base to the midpoint of the base.

Front

What is the formula for the area of an isosceles triangle?

Back

Area = (base * height) / 2.

Front

What is the relationship between the sides and angles in an isosceles triangle?

Back

In an isosceles triangle, the longer side is opposite the larger angle.

Front

What is the congruence postulate that can be used for isosceles triangles?

Back

The Side-Angle-Side (SAS) postulate can be used to prove the congruence of isosceles triangles.

Front

If the equal sides of an isosceles triangle are 10 cm each and the base is 8 cm, what is the height?

Back

The height is approximately 7.21 cm.

Front

What is the sum of the interior angles of any triangle?

Back

The sum of the interior angles of any triangle is 180 degrees.

Front

If one angle of an isosceles triangle is 40 degrees, what are the other two angles?

Back

The other two angles are each 70 degrees.