Similarity Circles

What is the dilation scale factor for mapping circle B onto circle A?

• 9/16

• 4/3

• 3/4

• 1

Tags

CCSS.HSG.CO.A.2

Circles X and Y have a similarity ratio of 1/2. Which of the following could NOT be true about the circles?

• Circle X has a radius of 5 while Circle Y has a radius of 10.

• Circle X has a circumference of 15π and Circle Y has a circumference of 30π.

• Circle X has a radius of 6 while Circle Y has a radius of 12.

• Circle X has a circumference of 60π while Circle Y has a circumference of 20π.

Tags

CCSS.7.G.A.1

If the scale factor between two arcs is 5/6, then the ratio of areas is...

• 5:6

• 10:12

• 25:36

• 125:216

Tags

CCSS.7.G.A.1

If the ratio of areas is 9:121, then the scale factor of the arc lengths could be...

(select all that apply)

• 3/11

• 9/121

• 11/3

• 121/9

Tags

CCSS.7.G.A.1

The radius of one circle is 9mm and the radius of a second circle is 21mm. What is the ratio of their areas in simplest form?

• 9:21

• 1:3

• 3:7

• 9:49

Tags

CCSS.7.G.B.4

• 9

• 3

• 1/3

Tags

CCSS.7.G.A.1

How many degrees are in a cirlce?

• 90

• 180

• 270

• 360

Tags

CCSS.4.MD.C.5B

CCSS.HSG.CO.A.1

If my diameter is 19 inches, what is my radius?

• 38 inches

• 9.5 inches

• 59.66 inches

• 119.32 inches

Tags

CCSS.7.G.B.4

If my radius is 10ft, what is my diameter?

• 20ft

• 5ft

• 31.4ft

• 62.8ft

Tags

CCSS.7.G.B.4

A segment connecting two points on a circle that passes through the center.

• diameter

• radius

• secant

• tangent