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Year 7 Area and Perimeter Worksheet — Level 3 — Answers

Answer sheet with worked solutions for the Year 7 area & perimeter worksheet.

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Success TutoringWorksheetsAnswer sheetYear 7 · Mathematics · Area & Perimeter

Year 7 Area and Perimeter Worksheet — Level 3 — Answers

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

1.A rectangle is 22 mm long and 11 mm wide. Find its area.

Answer: 242 mm2

  1. A = length × width = 22 × 11
  2. = 242 mm2
2.A triangle has a base of 17 cm and a perpendicular height of 14 cm. Find its area.

Answer: 119 cm2

  1. A = ½ × base × height = ½ × 17 × 14
  2. = 119 cm2
3.A triangle has a base of 19 cm and a perpendicular height of 13 cm. Find its area.

Answer: 123.5 cm2

  1. A = ½ × base × height = ½ × 19 × 13
  2. = 123.5 cm2
4.A triangle has a base of 4 mm and a perpendicular height of 11 mm. Find its area.

Answer: 22 mm2

  1. A = ½ × base × height = ½ × 4 × 11
  2. = 22 mm2
5.An L-shape is made from a 10 mm by 15 mm rectangle joined to a 3 mm by 10 mm rectangle. Find the total area.

Answer: 180 mm2

  1. Rectangle 1: 10 × 15 = 150
  2. Rectangle 2: 3 × 10 = 30
  3. Total: 150 + 30 = 180 mm2
6.A rectangle is 2 mm long and 2 mm wide. Find its area.

Answer: 4 mm2

  1. A = length × width = 2 × 2
  2. = 4 mm2
7.An L-shape is made from a 4 mm by 8 mm rectangle joined to a 3 mm by 10 mm rectangle. Find the total area.

Answer: 62 mm2

  1. Rectangle 1: 4 × 8 = 32
  2. Rectangle 2: 3 × 10 = 30
  3. Total: 32 + 30 = 62 mm2
8.A triangle has a base of 8 mm and a perpendicular height of 10 mm. Find its area.

Answer: 40 mm2

  1. A = ½ × base × height = ½ × 8 × 10
  2. = 40 mm2
9.A rectangle is 10 cm long and 18 cm wide. Find its area.

Answer: 180 cm2

  1. A = length × width = 10 × 18
  2. = 180 cm2
10.A triangle has a base of 15 mm and a perpendicular height of 9 mm. Find its area.

Answer: 67.5 mm2

  1. A = ½ × base × height = ½ × 15 × 9
  2. = 67.5 mm2
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