Circumference of Circles and Sectors

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

• Diameter
• Radius

• arc length

• area of a sector

• area of a segment

• perimeter of a sector

Calculate the length of the arc. Round your answer to 2 decimal places.

• 16.2 cm
• 64.8 cm
• 16.20 cm
• 64.79 cm

Calculate the length of the arc. Round to 2 decimal places.

• 346.36 mm
• 33.0 mm
• 32.99 mm
• 346.4 mm

Find the length of arc PQ to the nearest hundredth.

• 2.44 inches
  

• 7.68 inches
  

• 15.35 inches

• 3.84 inches

What is the distance around the semicircle? (Use 3.14 = π and round to the nearest tenths place)

• 18.5

• 11.3

• 20.3

• 22.6

Which formulas can be used to find the circumference of a circle?

• C = π r²

• C = 2π r

• C = π d

• C = 2πd

Diameter = _______ x Radius

• Circumference

• π

• 2

• Radius

Pi is approximately equal to?

• 2.71

• 19.6

• 7.2

• 3.14

Which of the following shows the correct working out when finding the arc length of the sector shown in the diagram?