5.04 "Circle" Quiz review

True or False:
A circle with a diameter of 10 inches has an Area of  $78.5\ in^2$  .

 $A\ =\ \pi r^2$  

• true

• false

 $C\ =\ 2\pi r\ or\ C\ =\ \pi d$  

Julie bought a soccer ball. The diameter of the ball is 9 in. What is the circumference of the soccer ball? (round the the tenths)

• 81 in

• 56.5 in

• 28.3 in

• 14.1 in

The radius of a ball is 55 mm. What is the diameter of the ball?

• 27.5 cm

• 27.5 mm

• 110 cm

• 110 mm

The diameter of a circle is 17 inches. What is the radius?

• 8.5 in

• 34 in

• 8.5 mm

• 34 mm

 $C\ =\ 2\pi r\ or\ C\ =\ \pi d$  

A circle has a radius of 13.5 yards. What is the Circumference of the circle? (round to the tenths)

• 572.3 yds

• 42.4 yds

• 84.8 yds

• 26 yrds

 $A\ =\ \pi r^2$  

What is the Area of this circle? (round to the tenths)

•  $116.7\ cm^2$  

•  $113.0\ cm^2$  

•  $37.7\ cm^{ }$  

•  $113.0\ cm$  

The circumference of a circle is 109.9 ft. What is the radius of this circle? (hint: work backwards... inverse operations)

• 9.9 ft

• 18.9 ft

• 17.5 ft

• 16.4 ft

True or false

A circle with radius of 3 inches has a Circumference of 18.8 in.

 $C\ =\ 2\pi r\ or\ C\ =\ \pi d$  

• false

• true

Define the circumference of a circle.

• both the outside and inside of a circle

• the inside of a circle

• the outside of a circle

• neither the inside or outside of a circle

True or False?

A circle that has a circumference of 100, what is the radius of the circle? (round to the nearest tenths place)