Topic 7 Geometry

The point (8, 12) was dilated to become point (2, 3). What was the scale factor?

• ½

• ¼

• 4

• 2

Find the missing length indicated.

• 8

• 9

• 25

• 12

Find the missing length.

• 25

• 20

• 21

• 15

Find the missing length.

• 15

• 11

• 35

• 8

Solve for x.

[Type your solution as a decimal]

Answer explanation

$\frac{x}{12}=\frac{6}{10}$

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

• 11/6

• 6/11

• 121/36

• 36/121

The scale factor of two similar figures is 4 : 5. What is the ratio of their perimeters?

• 4 : 5

• 16 : 25

• 64 : 125

• 8 : 10

If the ratio of 2 round dinner plates is 2 : 5, what is the ratio of their areas?

• 2 : 5

• 1 : 5

• 4 : 10

• 4 : 25

The area of triangle A is 54 and triangle B is 150. What is the scale factor of A to B? 

• 9:25

• 27:75

• 3:5

• 25:9