Unit 8.3: Area of a Circle

What is the formula for finding the area of a circle? Select all that alply

• A = π·d

• C = 2·π·r

• A = π·r²

• C = π·d

• A = r $\cdot$ r $\cdot$ $\pi$

What does A represent in the formula:

A = π·r²

• Area

• Radius

• Pi

• Diameter

Tags

CCSS.7.G.B.4

What does r represent in the formula:

A = π·r²

• circumference

• radius

• diameter

• squared

Tags

CCSS.7.G.B.4

What is the circumference of a circle with a radius of 5 in terms of π ?

• 5 π square units
• 10 π square units
• 25 π square units
• 50 π square units

Tags

CCSS.7.G.B.4

What is the area of this circle? Leave your answer in terms of  $\pi$  .

•  $40\pi\ in^2$  

•  $314.16\pi\ in^2$  

•  $100\pi\ in^2$  

•  $400\pi\ in^2$  

Tags

CCSS.7.G.B.4

Find the area of the circle, leaving your answer in terms of π

• 121π cm²

• 22π cm²

• 484π cm²

• 121π m²

Tags

CCSS.7.G.B.4

Find the area of the circle, use 3.14 for π. Round your answer to the nearest whole number.

• 121π cm²

• 380 cm²

• 35 cm²

• 69 m²

Find the area of the circle, giving your answer in terms of  $\pi$  .

•  $36\pi\ cm^2$  

•  $113\pi\ cm^2$  

•  $12\pi\ cm^2$  

•  $144\pi\ cm^2$  

Tags

CCSS.7.G.B.4

Marisa purchases a pot for her father's garden. The diameter of the bottom of the pot is 18 cm. What is the area of the pot's bottom? Use 3.14 for pi. Round to the nearest whole number.

• 28 cm²

• 57 cm²

• 254 cm²

• 1017 cm²

What is the area of this circle? Use 3.14 for pi. Round to the nearest tenth.

• 78.5 squared meters

• 15.7 squared meters

• 31.4 squared meters