9th Grade Area and Perimeter Worksheet — Level 2 — Practice Set 2 — Answers
Answer sheet with worked solutions for the 9th Grade area & perimeter worksheet.
Success TutoringWorksheetsAnswer sheet9th Grade · Mathematics · Area & Perimeter9th Grade Area and Perimeter Worksheet — Level 2 — Practice Set 2 — Answers
Write the formula, substitute, then calculate. Include units.
1.A triangle has a base of 14 cm and a height of 12 cm. Find its area.
Answer: 84 cm2
- A = ½ × base × height = ½ × 14 × 12
- = 84 cm2
2.A rectangle is 3 mm long and 18 mm wide. Find its perimeter.
Answer: 42 mm
- P = 2 × (3 + 18)
- = 2 × 21 = 42 mm
3.A triangle has a base of 8 mm and a height of 3 mm. Find its area.
Answer: 12 mm2
- A = ½ × base × height = ½ × 8 × 3
- = 12 mm2
4.A rectangle is 28 m long and 17 m wide. Find its area.
Answer: 476 m2
- A = length × width = 28 × 17
- = 476 m2
5.A rectangle is 12 cm long and 8 cm wide. Find its perimeter.
Answer: 40 cm
- P = 2 × (12 + 8)
- = 2 × 20 = 40 cm
6.A rectangle is 27 cm long and 4 cm wide. Find its area.
Answer: 108 cm2
- A = length × width = 27 × 4
- = 108 cm2
7.A rectangle is 27 m long and 7 m wide. Find its area.
Answer: 189 m2
- A = length × width = 27 × 7
- = 189 m2
8.A rectangle is 10 m long and 4 m wide. Find its area.
Answer: 40 m2
- A = length × width = 10 × 4
- = 40 m2
9.A rectangle is 24 mm long and 20 mm wide. Find its area.
Answer: 480 mm2
- A = length × width = 24 × 20
- = 480 mm2
10.A rectangle is 14 cm long and 20 cm wide. Find its area.
Answer: 280 cm2
- A = length × width = 14 × 20
- = 280 cm2
Marking tips
- Give credit for correct method even when the final answer slips — the working shows where the thinking went right.
- For open-ended tasks, use the success criteria as a checklist rather than looking for one "right" answer.
- Celebrate what went well first, then pick one thing to work on next.