Circle Area and Circumference Concept Check

Is the red line a radius or diameter of the circle?

• Radius
• Diameter

Is the red line a radius or diameter of the circle?

• Radius
• Diameter

_{What is the diameter of this circle? d = 2r}

• 5 in

• 10 in

• 3.14 in

What is the radius of this circle? r = d/2

• 18

• 10

• 9

• 8

find the area of the circle with radius 3 cm below.

A = r² π

• 100 cm²

• 225 cm²

• 28.26 cm²

Find the circumference C = 2rπ

• 87.92in

• 44 in

• None of the above

Find the area of the circle . A = r² π

• 56.52

• 254.34

• 113.04

Determine the radius of the penny

• 59.66 mm

• 9.5 mm

• 38 mm

Daniel wants to buy cookies for her friend. The

radius of a cookie is 5 inches. What is the cookie’s

circumference? C = 2rπ

• 10 in

• 2.5 in

• 31.4 in

Steven purchases a bowl. The diameter of the

bowl is 14 cm. What is the circumference of the

bowl? C = dπ

• 28 cm

• 43.98 cm

• 87.96 cm