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7th Grade Area and Perimeter Worksheet — Level 3 — Answers

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

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Success TutoringWorksheetsAnswer sheet7th Grade · Mathematics · Area & Perimeter

7th Grade Area and Perimeter Worksheet — Level 3 — Answers

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

1.A triangle has a base of 12 cm and a height of 6 cm. Find its area.

Answer: 36 cm2

  1. A = ½ × base × height = ½ × 12 × 6
  2. = 36 cm2
2.An L-shape is made from a 23 mm by 3 mm rectangle joined to a 13 mm by 5 mm rectangle. Find the total area.

Answer: 134 mm2

  1. Rectangle 1: 23 × 3 = 69
  2. Rectangle 2: 13 × 5 = 65
  3. Total: 69 + 65 = 134 mm2
3.A triangle has a base of 19 m and a height of 5 m. Find its area.

Answer: 47.5 m2

  1. A = ½ × base × height = ½ × 19 × 5
  2. = 47.5 m2
4.An L-shape is made from a 25 cm by 6 cm rectangle joined to a 19 cm by 5 cm rectangle. Find the total area.

Answer: 245 cm2

  1. Rectangle 1: 25 × 6 = 150
  2. Rectangle 2: 19 × 5 = 95
  3. Total: 150 + 95 = 245 cm2
5.A triangle has a base of 18 cm and a height of 13 cm. Find its area.

Answer: 117 cm2

  1. A = ½ × base × height = ½ × 18 × 13
  2. = 117 cm2
6.An L-shape is made from a 5 mm by 18 mm rectangle joined to a 3 mm by 22 mm rectangle. Find the total area.

Answer: 156 mm2

  1. Rectangle 1: 5 × 18 = 90
  2. Rectangle 2: 3 × 22 = 66
  3. Total: 90 + 66 = 156 mm2
7.A triangle has a base of 11 m and a height of 12 m. Find its area.

Answer: 66 m2

  1. A = ½ × base × height = ½ × 11 × 12
  2. = 66 m2
8.An L-shape is made from a 12 m by 16 m rectangle joined to a 9 m by 3 m rectangle. Find the total area.

Answer: 219 m2

  1. Rectangle 1: 12 × 16 = 192
  2. Rectangle 2: 9 × 3 = 27
  3. Total: 192 + 27 = 219 m2
9.A triangle has a base of 12 mm and a height of 4 mm. Find its area.

Answer: 24 mm2

  1. A = ½ × base × height = ½ × 12 × 4
  2. = 24 mm2
10.A rectangle is 22 mm long and 13 mm wide. Find its area.

Answer: 286 mm2

  1. A = length × width = 22 × 13
  2. = 286 mm2
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