Circles and Arcs

Which segment is the diameter?

• AC

• BD

• LM

• CE

What is the diameter?

• 8

• 16

• 10

• 4

What is the area of this semi circle? 

• 100.5 square cm

• 25.1  square cm

• 50.3 square cm

• 12.6 square cm

What number does π represent?

• 4.13

• 3.41

• pie

• 3.14

The definition of radius is

• distance from one point to another point

• distance around the circle

• distance from the center to any point on the circle

• distance across the circle through the center

Which expression could be used to find the approximate circumference of the quilt piece?

• 2(pi)16

• 2(pi)8

• 2(8)

• 2(4)

what is the formula for finding circumference

• c = π d

• c = 2 π r

• d = 2 r

• r = d/2

What does r represent in the formula:

A = π·r²

• circumference

• radius

• diameter

• squared

What is the diameter?

• 8

• 16

• 10

• 4

What is the formula for the circumference of a circle?