Printable · GCSE Foundation · ages 14-16

Arc lengths and sector areas worksheet — GCSE Foundation

Fifteen questions on "arc lengths and sector areas" — DfE statement G18. Print it, or print three versions so neighbours cannot copy by letter; the key gives the letter for each version.

VersionsA only A + B A + B + Csame questions, different order

AnswersQuestions only With answer key Key only

CalculatorMixed Non-calculator (Paper 1)Calculator (Papers 2 and 3)

New sheet

Arc lengths and sector areas worksheet — GCSE Foundation

Maths · GCSE Foundation · G18 · Arc lengths and sector areas · 15 questions

MathsUKwww.geekhero.co.uk

1.A sector of a circle has angle 120° and an arc length of 31.4 cm. Using π = 3.14, work out the radius of the circle.
(a)5 cm
(b)30 cm
(c)7.5 cm
(d)15 cm
2.A round cake has a radius of 10 cm. Icing costs £0.02 per square centimetre. One slice of the cake is a sector with an angle of 90°. Using π = 3.14, work out the cost of icing the top of that slice, to the nearest penny.
(a)£0.31
(b)£1.57
(c)£0.16
(d)£6.28
3.A sector of a circle has radius 7 cm and angle 90°. Using π = 3.14, work out the arc length of the sector, to 1 decimal place.
(a)5.5 cm
(b)44.0 cm
(c)11.0 cm
(d)22.0 cm
4.A sector of a circle has radius 6 cm and angle 150°. Using π = 3.14, work out the perimeter of the sector.
(a)15.7 cm
(b)21.7 cm
(c)27.7 cm
(d)31.4 cm
5.Priya says: 'To find the arc length of a sector, you divide the circumference by the angle in degrees.' Which statement about Priya's method is correct?
(a)Wrong: multiply by angle ÷ 360, not divide by it.
(b)Wrong: multiply by the angle only, no division.
(c)Wrong: use radius × angle, not circumference.
(d)Correct: dividing by the angle in degrees works.
6.A sector of a circle has radius 4 cm and angle 90°. Using π = 3.14, work out the area of the sector.
(a)3.14 cm²
(b)12.56 cm²
(c)6.28 cm²
(d)50.24 cm²
7.A sector has an angle of 45°. Priti says: 'The area of the sector is one eighth of the area of the full circle, whatever the radius is.' Is Priti correct?
(a)No, because 45 ÷ 360 = 1/6, not 1/8.
(b)Yes, but only because the radius happens to make 45° exactly one eighth of a full turn in this particular circle.
(c)No, because the fraction of the area also depends on the radius, so it is not fixed.
(d)Yes, because 45 ÷ 360 = 1/8, and this fraction applies to any radius.
8.A circular decoration has a radius of 10 cm. A ribbon costs £0.50 per centimetre and is fixed along the curved edge (the arc) of a sector-shaped section with an angle of 90°. Using π = 3.14, work out the cost of the ribbon for this section.
(a)£157.00
(b)£31.40
(c)£7.85
(d)£15.70
9.A sector of a circle has radius 5 cm and angle 72°. Work out the arc length of the sector, in terms of π.
(a)π cm
(b)4π cm
(c)10π cm
(d)2π cm
10.A sector of a circle has radius 10 cm and angle 150°. Using π = 3.14, work out the perimeter of the sector, to 1 decimal place.
(a)72.3 cm
(b)26.2 cm
(c)36.2 cm
(d)46.2 cm
11.A fan-shaped rug is in the shape of a sector of a circle with radius 4 m and angle 180°. It costs £4 per square metre to make. Using π = 3.14, work out the total cost of the rug.
(a)£50.24
(b)£25.12
(c)£200.96
(d)£100.48
12.A sprinkler waters a sector-shaped patch of a garden with radius 8 m and angle 90°. Work out the perimeter of the watered sector, to 1 decimal place. (Use π = 3.14.)
(a)28.6 m
(b)20.6 m
(c)12.6 m
(d)41.1 m
13.A sector of a circle has radius 15 cm and angle 216°. Using π = 3.14, work out the arc length of the sector.
(a)94.2 cm
(b)56.52 cm
(c)28.26 cm
(d)113.04 cm
14.A sector of a circle has radius 9 cm and angle 40°. Work out the area of the sector, in terms of π.
(a)2π cm²
(b)9π cm²
(c)81π cm²
(d)18π cm²
15.A sector of a circle has radius 9 cm and angle 120°. Using π = 3.14, work out the arc length of the sector, to 1 decimal place.
(a)56.5 cm
(b)37.7 cm
(c)9.4 cm
(d)18.8 cm

Build your own mix at the worksheet builder.