Isosceles Triangles practice

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle that has at least two sides of equal length. The angles opposite these sides are also equal.

Front

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

Back

The sum of the interior angles of a triangle is always 180°.

Front

If two angles of a triangle are equal, what can be said about the sides opposite those angles?

Back

The sides opposite the equal angles are also equal in length.

Front

In an isosceles triangle, if the base angles are 40°, what is the measure of the vertex angle?

Back

The vertex angle is 100°.

Front

If the vertex angle of an isosceles triangle is 120°, what are the measures of the base angles?

Back

Each base angle measures 30°.

Front

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

Back

In an isosceles triangle, the angles opposite the equal sides are equal.

Front

Solve for x: 2x + 10 = 50

Back

x = 20.

Front

If the lengths of the two equal sides of an isosceles triangle are 10 cm each, what is the minimum length of the base?

Back

The minimum length of the base must be greater than 0 cm.

Front

What is the formula for finding the area of a triangle?

Back

Area = 1/2 * base * height.

Front

If the base of an isosceles triangle is 16 cm and the height is 10 cm, what is the area?

Back

Area = 1/2 * 16 * 10 = 80 cm².