Circumference & Area

The length around the outside of a circle is its _____.

• circumference

• radius

• diameter

• area

The radius of a circle is 4 inches. How would you calculate the circumference?

• $\left(\pi\right)\left(4^2\right)$

• $\left(2\right)\left(\pi\right)\left(4\right)$

• $\left(\pi\right)\left(8^2\right)$

• $\left(2\right)\left(\pi\right)\left(8\right)$

Tags

CCSS.7.G.B.4

The diameter of a circle is 16 centimeters. How would you calculate the area?

• $\left(\pi\right)\left(8^2\right)$

• $\left(2\right)\left(\pi\right)\left(8\right)$

• $\left(\pi\right)\left(16^2\right)$

• $\left(2\right)\left(\pi\right)\left(16\right)$

The diameter of a circle is 8 inches. What is the circumference of the circle in terms of  $\pi$  ?

•  $4\pi$  

•  $8\pi$  

•  $16\pi$  

•  $64\pi$  

Tags

CCSS.7.G.B.4

The diameter of a cookie is 2 inches. If  $\pi=3.14$  , what is the area of the cookie, rounded to the nearest tenth?

•  $39.4\ in^2$  

•  $9.9\ in^2$  

•  $3.1\ in^2$  

•  $6.3\ in^2$  

Tags

CCSS.7.G.B.4

The circumference of a circle is  $16\pi$  inches. What is the radius of the circle?

• 2 in.

• 4 in.

• 8 in.

• 16 in.

Tags

CCSS.7.G.B.4

The area of a CD is  $36\pi\ cm^2$  . What is the diameter of the CD?

• 6 cm.

• 12 cm.

• 18 cm.

• 9 cm.

Tags

CCSS.7.G.B.4

The diameter of a cake is  $12$  centimeters, and the area of one slice of cake is  $4\pi\ cm^2$  . In terms of  $\pi$  , how many full slices can you cut out of the cake?

• 3

• 36

• 9

• 12

Tags

CCSS.HSG.C.B.5

In terms of  $\pi$ , how much bigger is the area of a pizza with a diameter of 18 in. than the area of pizza with a diameter of 10 in.?

•  $8\pi\ in^2$  

•  $56\pi\ in^2$  

•  $106\pi\ in^2$  

•  $224\pi\ in^2$  

Tags

CCSS.7.G.B.4

In terms of  $\pi$ , how much longer is the crust on a pizza with a radius of 10 in. than the crust of a pizza with a radius of 5 in.?

•  $5\pi\ in.$  

•  $10\pi\ in.$  

•  $75\pi\ in.$  

•  $300\pi\ in.$  

Tags

CCSS.3.MD.D.8