TEST - Area and Circumference of Circles

Which of the following best represents the circumference of a circle with a radius of 9 centimeters?

• $243cm$
  

• $56.52cm$
  

• $28.3cm$
  

• $60cm$
  

What is the circumference? (HINT:  $C=\pi d$  )

• 36

• $18\pi$

• $108\pi$
  

• $36\pi$
  

What is the circumference of this circle?

• 3.14 cm

• 37.68 cm

• 24 cm

• 68.4 cm

Determine the radius of the penny

• 59.66 mm
• 9.5 mm
• 38 mm
• 119.32 mm

Does this picture show the diameter or radius of a circle?

• Diameter
• Radius

What is the area of this circle?

• 163.2 $cm^2$

• 15.3 $cm^2$

• 124.2 $cm^2$

• 113.04 $cm^2$

What is the area of this circle?

• 1256.64 $in^2$

• 31.41 $in^2$

• 314.16 $in^2$

• 123.12 $in^2$

What is the diameter of this circle?

• A

• B

• C

• D

What is the circumference of this circle? Use the pi button on your calculator and round to the nearest whole number.

• A

• B

• C

• D

what is the area of this semicircle ?

• 100.48cm²
• 80cm²
• 200.96cm²
• none of the above