Circumference & Area of Circles; Arc Length & Sector Are

 The area of a circle has a formula of $A=2\pi r^2$ .

• True

• False

Find the circumference of the circle.

Round to the nearest tenth.

• C = 113.1 inches

• C = 1017.9 inches

• C = 254.5 inches

• C = 56.5 inches

Find the area of the circle.

Round to the nearest tenth.

• A = 18.8 cm²

• A = 254.5 cm²

• A = 9 cm²

• A = 28.3 cm²

The Homeowner's Association in your neighborhood wants to enclose a circular playground with a fence. In order to purchase the fencing, do they need to calculate the area or circumference of the playground?

• Area

• Circumference

• Neither

What is the circumference of a circle with radius of 6?

Write your answer in terms of pi.

• C = $12\pi$

• C = $6\pi$

• C = $36\pi$

• C = $144\pi$

What is the radius of a circle with an area of 49π?

• r = 49

• r = 10

• r = 7

• r = 14

What is the distance marked off by L called?

• Circumference

• Tangent

• Arc Length

• Sector

What is the green area called?

• sector

• segment

• arc

• section

What is the area of the shaded sector?

Round to the nearest tenth.

• 27.9 ft²

• 558.5 ft²

• 139.6 ft²

Find the arc length of the bolded arc.

Round to the nearest tenth.

• 110.6 cm

• 17 cm

• 1.5 cm