Circumference of Circles and Perimeter of Sectors

Diameter = _______ x Radius

• Circumference

• π

• 2

• Radius

• arc length

• area of a sector

• area of a segment

• perimeter of a sector

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

• Diameter
• Radius

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

Pi is approximately equal to?

• 2.71

• 19.6

• 7.2

• 3.14

Work out the perimeter of the sector in metres (rounding to 1 decimal place).

(a)  

What is the circumference of a circle with a radius of 4 cm (rounded to 2 decimal places)?

• 25.13 cm

• 12.56 cm

• 6.28 cm

• 50.24 cm

What is the circumference of this circle (rounded to 2 decimal places)?

(a)  

What is the circumference of this circle (rounded to 2 decimal places)?

(a)  

Name the circle part shown in green

• Sector

• Arc

• Segment

• Radius