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 are the properties of an isosceles triangle?

Back

1. Two sides are equal in length. 2. The angles opposite the equal sides are also equal.

Front

What is the Isosceles Triangle Theorem?

Back

The Isosceles Triangle Theorem states that in an isosceles triangle, the angles opposite the equal sides are equal.

Front

How do you find the vertex angle of an isosceles triangle?

Back

To find the vertex angle, subtract the sum of the base angles from 180 degrees.

Front

What is the sum of the angles in any triangle?

Back

The sum of the angles in any triangle is always 180 degrees.

Front

Classify an isosceles triangle with angles measuring 70°, 70°, and 40°.

Back

It is an acute isosceles triangle.

Front

Classify an isosceles triangle with angles measuring 90°, 45°, and 45°.

Back

It is a right isosceles triangle.

Front

What is the base of an isosceles triangle?

Back

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

Front

If the equal sides of an isosceles triangle are each 5 cm, what is the minimum length of the base?

Back

The minimum length of the base must be greater than 0 cm and less than 10 cm.

Front

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

Back

In an isosceles triangle, the equal sides correspond to the equal angles.