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9th Grade Area and Perimeter Worksheet — Level 3 — Practice Set 2 — Answers

Answer sheet with worked solutions for the 9th Grade area & perimeter worksheet.

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Success TutoringWorksheetsAnswer sheet9th Grade · Mathematics · Area & Perimeter

9th Grade Area and Perimeter Worksheet — Level 3 — Practice Set 2 — Answers

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

1.An L-shape is made from a 21 cm by 6 cm rectangle joined to a 8 cm by 6 cm rectangle. Find the total area.

Answer: 174 cm2

  1. Rectangle 1: 21 × 6 = 126
  2. Rectangle 2: 8 × 6 = 48
  3. Total: 126 + 48 = 174 cm2
2.An L-shape is made from a 11 m by 3 m rectangle joined to a 2 m by 6 m rectangle. Find the total area.

Answer: 45 m2

  1. Rectangle 1: 11 × 3 = 33
  2. Rectangle 2: 2 × 6 = 12
  3. Total: 33 + 12 = 45 m2
3.An L-shape is made from a 18 m by 5 m rectangle joined to a 10 m by 7 m rectangle. Find the total area.

Answer: 160 m2

  1. Rectangle 1: 18 × 5 = 90
  2. Rectangle 2: 10 × 7 = 70
  3. Total: 90 + 70 = 160 m2
4.A triangle has a base of 13 mm and a height of 11 mm. Find its area.

Answer: 71.5 mm2

  1. A = ½ × base × height = ½ × 13 × 11
  2. = 71.5 mm2
5.An L-shape is made from a 21 m by 20 m rectangle joined to a 15 m by 6 m rectangle. Find the total area.

Answer: 510 m2

  1. Rectangle 1: 21 × 20 = 420
  2. Rectangle 2: 15 × 6 = 90
  3. Total: 420 + 90 = 510 m2
6.An L-shape is made from a 19 mm by 6 mm rectangle joined to a 18 mm by 4 mm rectangle. Find the total area.

Answer: 186 mm2

  1. Rectangle 1: 19 × 6 = 114
  2. Rectangle 2: 18 × 4 = 72
  3. Total: 114 + 72 = 186 mm2
7.A rectangle is 9 mm long and 3 mm wide. Find its area.

Answer: 27 mm2

  1. A = length × width = 9 × 3
  2. = 27 mm2
8.An L-shape is made from a 28 m by 3 m rectangle joined to a 5 m by 7 m rectangle. Find the total area.

Answer: 119 m2

  1. Rectangle 1: 28 × 3 = 84
  2. Rectangle 2: 5 × 7 = 35
  3. Total: 84 + 35 = 119 m2
9.An L-shape is made from a 21 cm by 15 cm rectangle joined to a 11 cm by 11 cm rectangle. Find the total area.

Answer: 436 cm2

  1. Rectangle 1: 21 × 15 = 315
  2. Rectangle 2: 11 × 11 = 121
  3. Total: 315 + 121 = 436 cm2
10.A rectangle is 25 mm long and 10 mm wide. Find its area.

Answer: 250 mm2

  1. A = length × width = 25 × 10
  2. = 250 mm2
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