two isosceles triangle theorem

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 angles in an isosceles triangle?

Back

The angles opposite the equal sides of an isosceles triangle 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 Two Isosceles Triangle Theorem?

Back

If two isosceles triangles have equal base angles, then the triangles are congruent.

Front

If the base angles of an isosceles triangle are 40 degrees, what is the vertex angle?

Back

The vertex angle is 100 degrees.

Front

In an isosceles triangle, if one angle is 30 degrees, what are the other two angles?

Back

The other two angles are each 75 degrees.

Front

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

Back

The sides opposite equal angles are equal in length.

Front

How can you determine if two triangles are congruent using the Isosceles Triangle Theorem?

Back

If two triangles have two equal sides and the angles opposite those sides are equal, then the triangles are congruent.

Front

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

Back

Area = (base * height) / 2.