Intro to Similarity

How many pairs of congruent angles in 2 triangles are needed to prove the 2 triangles are similar?

• 2 or 3

• 1

• 0

• only 3

Two objects that are the same shape but not the same size are _______.

• Congruent

• Vertical

• Similar

• Complementary 

Sides in similar figures must be proportional.  

• True

• False 

Mrs. Ashley used similar triangles to make a design.  Which statement about the triangles in the design must be true?

• They are the same size and shape.

• They are the same size but different shapes.

• They have corresponding angles that are congruent.

• They have corresponding sides that are congruent.

All corresponding angles in similar figures are congruent.  

• True

• False

The 2 triangles are similar. Write a similarity statement.

The polygons are similar. Find the value of the missing side.

The 2 polygons are similar. Find the value of the missing side.

Solve for x. The triangles are similar.

The polygons are similar. Find the scale factor of the smaller figure to the larger figure. (write your answer in a:b format)