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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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Success TutoringWorksheetsAnswer sheetYear 8 · Mathematics · Area & Perimeter

Year 8 Area and Perimeter Worksheet — Level 3 — Answers

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

1.A triangle has a base of 5 m and a perpendicular height of 4 m. Find its area.

Answer: 10 m2

  1. A = ½ × base × height = ½ × 5 × 4
  2. = 10 m2
2.A rectangle is 3 mm long and 8 mm wide. Find its area.

Answer: 24 mm2

  1. A = length × width = 3 × 8
  2. = 24 mm2
3.A rectangle is 23 mm long and 19 mm wide. Find its area.

Answer: 437 mm2

  1. A = length × width = 23 × 19
  2. = 437 mm2
4.A rectangle is 6 mm long and 13 mm wide. Find its area.

Answer: 78 mm2

  1. A = length × width = 6 × 13
  2. = 78 mm2
5.An L-shape is made from a 17 cm by 9 cm rectangle joined to a 3 cm by 2 cm rectangle. Find the total area.

Answer: 159 cm2

  1. Rectangle 1: 17 × 9 = 153
  2. Rectangle 2: 3 × 2 = 6
  3. Total: 153 + 6 = 159 cm2
6.An L-shape is made from a 29 cm by 7 cm rectangle joined to a 24 cm by 12 cm rectangle. Find the total area.

Answer: 491 cm2

  1. Rectangle 1: 29 × 7 = 203
  2. Rectangle 2: 24 × 12 = 288
  3. Total: 203 + 288 = 491 cm2
7.A rectangle is 22 cm long and 2 cm wide. Find its area.

Answer: 44 cm2

  1. A = length × width = 22 × 2
  2. = 44 cm2
8.An L-shape is made from a 22 mm by 4 mm rectangle joined to a 20 mm by 2 mm rectangle. Find the total area.

Answer: 128 mm2

  1. Rectangle 1: 22 × 4 = 88
  2. Rectangle 2: 20 × 2 = 40
  3. Total: 88 + 40 = 128 mm2
9.An L-shape is made from a 6 mm by 12 mm rectangle joined to a 4 mm by 6 mm rectangle. Find the total area.

Answer: 96 mm2

  1. Rectangle 1: 6 × 12 = 72
  2. Rectangle 2: 4 × 6 = 24
  3. Total: 72 + 24 = 96 mm2
10.An L-shape is made from a 2 cm by 2 cm rectangle joined to a 2 cm by 4 cm rectangle. Find the total area.

Answer: 12 cm2

  1. Rectangle 1: 2 × 2 = 4
  2. Rectangle 2: 2 × 4 = 8
  3. Total: 4 + 8 = 12 cm2
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