Area and Perimeter Scale Factor

Calculate the value of the scale factor between the 2 triangles

• 2.5

• 3

• 3.5

• 4

Find the ratio (blue to red) of the area.

• 4/7

• 7/4

• 49/16

• 16/49

What is the scale factor?

• 4

• 25

• 5

• 6

If two figures are similar, the corresponding sides are ______________.

• equal

• congruent

• proportional

• none of these

The two rectangles are scale drawings. What is the measurement of x?

• 21

• 1.25

• 20

• 4

what is the length of x?

• 9mm

• 4mm

• 4/9mm

• 36mm

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

• an enlargement

• a reduction

• a scale factor

If the scale factor is greater than one, the new figure will be

• reduction

• enlargement

• scale

• not proportional

The pair of figures is similar. Find the missing side.

• x = 1

• x = 3

• x = 9

• x = 5

Find the ratio (blue to red) of the perimeter.

• 4/7

• 7/4

• 49/16

• 16/49