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8th Grade Area and Perimeter Worksheet — Level 3 — Practice Set 4 — Answers

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

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Success TutoringWorksheetsAnswer sheet8th Grade · Mathematics · Area & Perimeter

8th Grade Area and Perimeter Worksheet — Level 3 — Practice Set 4 — Answers

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

1.A rectangle is 20 cm long and 19 cm wide. Find its area.

Answer: 380 cm2

  1. A = length × width = 20 × 19
  2. = 380 cm2
2.An L-shape is made from a 4 mm by 18 mm rectangle joined to a 2 mm by 2 mm rectangle. Find the total area.

Answer: 76 mm2

  1. Rectangle 1: 4 × 18 = 72
  2. Rectangle 2: 2 × 2 = 4
  3. Total: 72 + 4 = 76 mm2
3.An L-shape is made from a 2 m by 10 m rectangle joined to a 2 m by 13 m rectangle. Find the total area.

Answer: 46 m2

  1. Rectangle 1: 2 × 10 = 20
  2. Rectangle 2: 2 × 13 = 26
  3. Total: 20 + 26 = 46 m2
4.A triangle has a base of 16 cm and a height of 3 cm. Find its area.

Answer: 24 cm2

  1. A = ½ × base × height = ½ × 16 × 3
  2. = 24 cm2
5.An L-shape is made from a 10 mm by 14 mm rectangle joined to a 6 mm by 19 mm rectangle. Find the total area.

Answer: 254 mm2

  1. Rectangle 1: 10 × 14 = 140
  2. Rectangle 2: 6 × 19 = 114
  3. Total: 140 + 114 = 254 mm2
6.A triangle has a base of 9 cm and a height of 7 cm. Find its area.

Answer: 31.5 cm2

  1. A = ½ × base × height = ½ × 9 × 7
  2. = 31.5 cm2
7.A triangle has a base of 7 cm and a height of 6 cm. Find its area.

Answer: 21 cm2

  1. A = ½ × base × height = ½ × 7 × 6
  2. = 21 cm2
8.A triangle has a base of 15 mm and a height of 8 mm. Find its area.

Answer: 60 mm2

  1. A = ½ × base × height = ½ × 15 × 8
  2. = 60 mm2
9.An L-shape is made from a 25 cm by 6 cm rectangle joined to a 15 cm by 7 cm rectangle. Find the total area.

Answer: 255 cm2

  1. Rectangle 1: 25 × 6 = 150
  2. Rectangle 2: 15 × 7 = 105
  3. Total: 150 + 105 = 255 cm2
10.A rectangle is 6 cm long and 17 cm wide. Find its area.

Answer: 102 cm2

  1. A = length × width = 6 × 17
  2. = 102 cm2
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