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Year 8 Area and Perimeter Worksheet — Level 3 — Practice Set 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 — Practice Set 3 — Answers

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

1.A triangle has a base of 17 cm and a perpendicular height of 7 cm. Find its area.

Answer: 59.5 cm2

  1. A = ½ × base × height = ½ × 17 × 7
  2. = 59.5 cm2
2.An L-shape is made from a 19 cm by 15 cm rectangle joined to a 18 cm by 2 cm rectangle. Find the total area.

Answer: 321 cm2

  1. Rectangle 1: 19 × 15 = 285
  2. Rectangle 2: 18 × 2 = 36
  3. Total: 285 + 36 = 321 cm2
3.A triangle has a base of 7 cm and a perpendicular height of 11 cm. Find its area.

Answer: 38.5 cm2

  1. A = ½ × base × height = ½ × 7 × 11
  2. = 38.5 cm2
4.A rectangle is 22 mm long and 12 mm wide. Find its area.

Answer: 264 mm2

  1. A = length × width = 22 × 12
  2. = 264 mm2
5.An L-shape is made from a 27 m by 9 m rectangle joined to a 9 m by 7 m rectangle. Find the total area.

Answer: 306 m2

  1. Rectangle 1: 27 × 9 = 243
  2. Rectangle 2: 9 × 7 = 63
  3. Total: 243 + 63 = 306 m2
6.An L-shape is made from a 7 m by 8 m rectangle joined to a 2 m by 7 m rectangle. Find the total area.

Answer: 70 m2

  1. Rectangle 1: 7 × 8 = 56
  2. Rectangle 2: 2 × 7 = 14
  3. Total: 56 + 14 = 70 m2
7.A rectangle is 23 cm long and 2 cm wide. Find its area.

Answer: 46 cm2

  1. A = length × width = 23 × 2
  2. = 46 cm2
8.A triangle has a base of 5 m and a perpendicular height of 11 m. Find its area.

Answer: 27.5 m2

  1. A = ½ × base × height = ½ × 5 × 11
  2. = 27.5 m2
9.A rectangle is 18 cm long and 20 cm wide. Find its area.

Answer: 360 cm2

  1. A = length × width = 18 × 20
  2. = 360 cm2
10.A triangle has a base of 19 mm and a perpendicular height of 13 mm. Find its area.

Answer: 123.5 mm2

  1. A = ½ × base × height = ½ × 19 × 13
  2. = 123.5 mm2
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