Isosceles Base Angles

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 base angles in an isosceles triangle?

Back

The base angles are the angles opposite the equal sides of an isosceles triangle.

Front

What is the Isosceles Triangle Theorem?

Back

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

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

What is the relationship between the base angles and the vertex angle in an isosceles triangle?

Back

The base angles are equal, and the vertex angle is the angle formed by the two equal sides.

Front

How can you determine the measure of the vertex angle if the base angles are known?

Back

The measure of the vertex angle can be found using the formula: Vertex Angle = 180° - 2(Base Angle).

Front

What is the SAS (Side-Angle-Side) Congruence Theorem?

Back

The SAS Congruence Theorem states that if two sides and the included angle of one triangle are equal to two sides and the included angle of another triangle, then the triangles are congruent.

Front

What is the AAS (Angle-Angle-Side) Congruence Theorem?

Back

The AAS Congruence Theorem states that if two angles and a non-included side of one triangle are equal to two angles and the corresponding non-included side of another triangle, then the triangles are congruent.

Front

What is the SSS (Side-Side-Side) Congruence Theorem?

Back

The SSS Congruence Theorem states that if three sides of one triangle are equal to three sides of another triangle, then the triangles are congruent.

Front

What is the ASA (Angle-Side-Angle) Congruence Theorem?

Back

The ASA Congruence Theorem states that if two angles and the included side of one triangle are equal to two angles and the included side of another triangle, then the triangles are congruent.