Circle Basics

What is AB?

• diameter
• center
• circumference
• radius

Tags

CCSS.HSG.C.A.2

Determine the radius of the penny.

• 361 mm²

• 38 mm

• 9.5 mm

• 4.4 mm

Jacob is painting a circular picture on his wall.  If the painting has a diameter of 4 ft, how much paint will he need to cover the inside of the circle?  Is this question asking you to find the area, circumference, or neither?

• area
• circumference
• neither

Tags

CCSS.HSG.GMD.A.1

Find the circumference.

• $28\pi$ in

• $14\pi$ in
  

• $196\pi$ square in

• None of the above

Alex has trained his puppy, Popper, to jump through a ring. According to Alex's measurements and calculations, the ring has a diameter of 3.5 feet. What is the ring's circumference (use 3.14 for pi)?

• 21.98 ft

• 38.47 square ft

• 10.99 ft

• 9.62 square ft

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

• $3\pi\ cm^2$

• $6\pi\ cm$
  

• $9\pi\ cm^2$
  

• none of the above

A clock face has a diameter of 10 inches. What is the approximate area of the clock face? Use 3.14 for pi.

•  $31.4\ in$  
  

•  $314\ in^2$  
  

•  $15.7\ in$  
  

•  $78.5\ in^2$  
  

Find the diameter. (Hint: how can we find the missing side of a right triangle?)

• 31 cm

• 25 cm

• 15.5 cm

• 12.5 cm