Circles - Circumference and Area

The diameter at the thickest part of a doorknob is 2 inches. Which equation expresses the circumference of this doorknob at the thickest part in inches?

• C = 2 x 2 x  $\pi$  

• C = 2 x  $\pi$  

• C = $2^2$  x  $\pi$  

• C = 2 x  $\pi$  x  $2^2$  

Tags

CCSS.7.G.B.4

Which measurement is a good approximation for the circumference of a circle if the diameter is 15 inches?

• $\frac{330}{7}$ inches

• $\frac{660}{7}$ inches

• $\frac{2475}{14}$ inches

• $\frac{4950}{7}$ inches

Tags

CCSS.7.G.B.4

If line BC is the diameter of the circle below, what is the area of the circle? 

• 9 $\pi$  square units

• 16 $\pi$  square units

• 36 $\pi$  square units

• 64 $\pi$  square units

Tags

CCSS.7.G.B.4

A bicycle tire makes 40 full revolutions while traveling from where Scott is standing to where Steve is standing.

If the tire has a diameter of 20 inches, what is the approximate distance between Scott and Steve?

• 12,500 inches

• 5,000 inches

• 2,500 inches

• 800 inches

Tags

CCSS.HSG.SRT.C.8

The clock on the wall in Mark's classroom has a minute hand that is 6 inches long.

What is the approximate distance the outermost tip of the minute hand travels in one hour?

• 113.04 inches

• 37.68 inches

• 18.84 inches

• 15.14 inches

Tags

CCSS.3.MD.D.8

A circle has a diameter of 100 inches. Which expression could be used to find the area of the circle?

• $100^2\ \times\pi$
  

• $50^2\ \times\pi$

• $2\ \times\ 50^2\ \times\ \pi$

• $2\ \times10^2\ \times\ \pi$

Tags

CCSS.7.G.B.4

Ivana is calculating the area of a circle with a radius of

 $\frac{3}{4}$  in. Which of the following gives the BEST estimation of the area?

•  $\left(\frac{3}{4}\right)^2\ \times\frac{7}{22}$  

•  $\left(\frac{3}{4}\right)^2\ \times\frac{22}{7}$  

•  $\left(\frac{3}{4}\right)^2\ \times\ 7\frac{1}{22}$  

•  $\left(\frac{3}{4}\right)^2\ \times\ 22\ \frac{1}{7}$  

Tags

CCSS.7.G.B.4