Similarity & Scale Factor

Front

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

Back

Similar

Front

Two shapes that are congruent are also similar. True or False?

Back

True

Front

If the scale factor is less than one, the new figure will be _______.

Back

a reduction

Front

What is the scale factor from ΔDEF to ΔABC if the sides of ΔDEF are half the length of the sides of ΔABC?

Back

1/2

Front

What is the scale factor from ABCD to MNOP if the sides of MNOP are two-thirds the length of the sides of ABCD?

Back

2/3

Front

Define 'scale factor'.

Back

The ratio of the lengths of corresponding sides of two similar figures.

Front

What does it mean for two shapes to be 'congruent'?

Back

Two shapes that are the same size and shape.

Front

If a shape is enlarged by a scale factor of 3, what happens to its area?

Back

The area increases by a scale factor of 3², or 9.

Front

If a shape is reduced by a scale factor of 1/4, what happens to its perimeter?

Back

The perimeter is reduced by a scale factor of 1/4.

Front

What is the relationship between similar figures and their corresponding angles?

Back

Corresponding angles of similar figures are equal.