7th Grade Area and Perimeter Worksheet — Level 3 — Practice Set 4 — Answers
Answer sheet with worked solutions for the 7th Grade area & perimeter worksheet.
Success TutoringWorksheetsAnswer sheet7th Grade · Mathematics · Area & Perimeter7th Grade Area and Perimeter Worksheet — Level 3 — Practice Set 4 — Answers
Write the formula, substitute, then calculate. Include units.
1.A rectangle is 19 mm long and 17 mm wide. Find its area.
Answer: 323 mm2
- A = length × width = 19 × 17
- = 323 mm2
2.A rectangle is 2 mm long and 10 mm wide. Find its area.
Answer: 20 mm2
- A = length × width = 2 × 10
- = 20 mm2
3.An L-shape is made from a 21 mm by 18 mm rectangle joined to a 9 mm by 4 mm rectangle. Find the total area.
Answer: 414 mm2
- Rectangle 1: 21 × 18 = 378
- Rectangle 2: 9 × 4 = 36
- Total: 378 + 36 = 414 mm2
4.A triangle has a base of 5 mm and a height of 12 mm. Find its area.
Answer: 30 mm2
- A = ½ × base × height = ½ × 5 × 12
- = 30 mm2
5.An L-shape is made from a 13 cm by 3 cm rectangle joined to a 12 cm by 5 cm rectangle. Find the total area.
Answer: 99 cm2
- Rectangle 1: 13 × 3 = 39
- Rectangle 2: 12 × 5 = 60
- Total: 39 + 60 = 99 cm2
6.An L-shape is made from a 6 m by 13 m rectangle joined to a 3 m by 11 m rectangle. Find the total area.
Answer: 111 m2
- Rectangle 1: 6 × 13 = 78
- Rectangle 2: 3 × 11 = 33
- Total: 78 + 33 = 111 m2
7.A triangle has a base of 9 m and a height of 10 m. Find its area.
Answer: 45 m2
- A = ½ × base × height = ½ × 9 × 10
- = 45 m2
8.An L-shape is made from a 7 cm by 15 cm rectangle joined to a 6 cm by 11 cm rectangle. Find the total area.
Answer: 171 cm2
- Rectangle 1: 7 × 15 = 105
- Rectangle 2: 6 × 11 = 66
- Total: 105 + 66 = 171 cm2
9.An L-shape is made from a 3 m by 9 m rectangle joined to a 2 m by 3 m rectangle. Find the total area.
Answer: 33 m2
- Rectangle 1: 3 × 9 = 27
- Rectangle 2: 2 × 3 = 6
- Total: 27 + 6 = 33 m2
10.A triangle has a base of 5 cm and a height of 8 cm. Find its area.
Answer: 20 cm2
- A = ½ × base × height = ½ × 5 × 8
- = 20 cm2
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