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.

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Arc lengths and sector areas worksheet — GCSE Foundation

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

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1.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.
2.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
3.A sector of a circle has radius 6 cm and an arc length of 15.7 cm. Using π = 3.14, work out the angle of the sector.
(a)150°
(b)300°
(c)42°
(d)157°
4.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
5.A sector of a circle has an angle of 90° and an area of 78.5 cm². Using π = 3.14, work out the radius of the circle.
(a)10 cm
(b)20 cm
(c)100 cm
(d)5 cm
6.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
7.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
8.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
9.A sector of a circle has radius 6 cm and an area of 4.71 cm². Using π = 3.14, work out the angle of the sector.
(a)3.75°
(b)45°
(c)90°
(d)15°
10.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
11.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.
12.A sector of a circle has an angle of 90° and an arc length of 15.7 cm. Using π = 3.14, work out the radius of the circle.
(a)20 cm
(b)10 cm
(c)5 cm
(d)2.5 cm
13.A sector of a circle has radius 6 cm and angle 60°. Work out the arc length of the sector, in terms of π.
(a)12π cm
(b)6π cm
(c)π cm
(d)2π cm
14.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
15.A sector of a circle has an angle of 150°. Work out what fraction of the circle's area the sector is.
(a)5/12
(b)7/12
(c)5/6
(d)1/2

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