Similar Triangles

Front

What are similar triangles?

Back

Triangles that have the same shape but may differ in size. Their corresponding angles are equal, and their corresponding sides are in proportion.

Front

What does it mean for angles in similar figures?

Back

All angles in similar figures are congruent (equal in measure).

Front

What is the similarity statement for triangles?

Back

A statement that indicates two triangles are similar, typically written as ΔABC ∼ ΔDEF.

Front

If two triangles are similar, what can be said about their sides?

Back

The lengths of their corresponding sides are proportional.

Front

What is the AA criterion for triangle similarity?

Back

If two angles of one triangle are equal to two angles of another triangle, the triangles are similar.

Front

What is the SSS criterion for triangle similarity?

Back

If the lengths of the corresponding sides of two triangles are proportional, then the triangles are similar.

Front

What is the SAS criterion for triangle similarity?

Back

If two sides of one triangle are proportional to two sides of another triangle and the included angles are equal, then the triangles are similar.

Front

Back

x = 12.

Front

If triangle ABC is similar to triangle DEF, and the length of side AB is 4 cm and side DE is 8 cm, what is the ratio of their sides?

Back

The ratio of their sides is 1:2.

Front

What is a proportional relationship in similar triangles?

Back

A relationship where the ratios of the lengths of corresponding sides are equal.