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Year 8 Area and Perimeter Worksheet — Level 3 — Answers

Answer sheet with worked solutions for the Year 8 area & perimeter worksheet.

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Year 8 · Mathematics · Area & Perimeter

Year 8 Area and Perimeter Worksheet — Level 3 — Answers

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Write the formula, substitute, then calculate. Include units.

1.A rectangle is 20 mm long and 5 mm wide. Find its area.

Answer: 100 mm2

  1. A = length × width = 20 × 5
  2. = 100 mm2
2.A rectangle is 8 cm long and 13 cm wide. Find its area.

Answer: 104 cm2

  1. A = length × width = 8 × 13
  2. = 104 cm2
3.A triangle has a base of 20 mm and a perpendicular height of 15 mm. Find its area.

Answer: 150 mm2

  1. A = ½ × base × height = ½ × 20 × 15
  2. = 150 mm2
4.An L-shape is made from a 13 m by 2 m rectangle joined to a 2 m by 5 m rectangle. Find the total area.

Answer: 36 m2

  1. Rectangle 1: 13 × 2 = 26
  2. Rectangle 2: 2 × 5 = 10
  3. Total: 26 + 10 = 36 m2
5.A triangle has a base of 4 mm and a perpendicular height of 10 mm. Find its area.

Answer: 20 mm2

  1. A = ½ × base × height = ½ × 4 × 10
  2. = 20 mm2
6.A rectangle is 5 mm long and 8 mm wide. Find its area.

Answer: 40 mm2

  1. A = length × width = 5 × 8
  2. = 40 mm2
7.An L-shape is made from a 21 cm by 6 cm rectangle joined to a 14 cm by 10 cm rectangle. Find the total area.

Answer: 266 cm2

  1. Rectangle 1: 21 × 6 = 126
  2. Rectangle 2: 14 × 10 = 140
  3. Total: 126 + 140 = 266 cm2
8.A triangle has a base of 17 m and a perpendicular height of 12 m. Find its area.

Answer: 102 m2

  1. A = ½ × base × height = ½ × 17 × 12
  2. = 102 m2
9.A triangle has a base of 16 cm and a perpendicular height of 12 cm. Find its area.

Answer: 96 cm2

  1. A = ½ × base × height = ½ × 16 × 12
  2. = 96 cm2
10.A rectangle is 21 mm long and 17 mm wide. Find its area.

Answer: 357 mm2

  1. A = length × width = 21 × 17
  2. = 357 mm2
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