MATHS MAESTRI

Grade 8 Measurement

Perimeter · Area · Volume · Surface Area

31-question pool Random draw Worked solutions

What this quiz covers

Grade 8 — Measurement Quiz | Maths Maestri draws its questions at random from 31 questions across these topics:

Worked examples

A few of the question types, with full solutions, so you know what to expect.

Perimeter. A rectangle has length 15 cm and width 6 cm. What is its perimeter?

  1. 42 cm
  2. 90 cm
  3. 21 cm
  4. 32 cm

Answer: 42 cm

P = 2(l + w) = 2(15 + 6) = 2(21) = 42 cm

Perimeter. A square has side 9 cm. What is its perimeter?

  1. 81 cm
  2. 18 cm
  3. 36 cm
  4. 27 cm

Answer: 36 cm

P = 4s = 4 × 9 = 36 cm

Perimeter. A triangle has sides 5 cm, 8 cm and 11 cm. What is its perimeter?

  1. 24 cm
  2. 440 cm
  3. 19 cm
  4. 14 cm

Answer: 24 cm

P = a + b + c = 5 + 8 + 11 = 24 cm

Perimeter. A circle has radius 7 cm. What is its circumference? (\(\pi \approx 3.14\))

  1. 43.96 cm
  2. 21.98 cm
  3. 153.86 cm
  4. 87.92 cm

Answer: 43.96 cm

C = 2\(\pi\)r = 2 × 3.14 × 7 = 43.96 cm

Perimeter. A rectangle has perimeter 56 m and length 18 m. What is its width?

  1. 10 m
  2. 28 m
  3. 38 m
  4. 20 m

Answer: 10 m

56 = 2(18 + w) ⇒ 28 = 18 + w ⇒ w = 10 m