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8th Grade Circumference and Area of Circles Worksheet — Level 2 — Practice Set 2 — 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 Circumference and Area of Circles Worksheet — Level 2 — Practice Set 2 — Answers

Show your work. Use the π button on your calculator and round to 1 decimal place unless told otherwise.

1.Find the area of a semicircle with a radius of 17 cm, correct to 1 decimal place.

Answer: 454.0 cm2

  1. A = ½ × π × r2 = ½ × π × 289
  2. ≈ 454.0 cm2
2.A circle has a radius of 10 cm. Find its area, correct to 1 decimal place.

Answer: 314.2 cm2

  1. A = π × r2 = π × 102 = π × 100
  2. ≈ 314.2 cm2
3.A circle has a radius of 5 cm. Find its circumference, correct to 1 decimal place.

Answer: 31.4 cm

  1. C = 2 × π × r = 2 × π × 5
  2. ≈ 31.4 cm
4.A circle has a diameter of 4 cm. Find its area, correct to 1 decimal place.

Answer: 12.6 cm2

  1. r = 4 ÷ 2 = 2 cm
  2. A = π × r2 = π × 22 = π × 4
  3. ≈ 12.6 cm2
5.A circle has a radius of 6 cm. Find its circumference, correct to 1 decimal place.

Answer: 37.7 cm

  1. C = 2 × π × r = 2 × π × 6
  2. ≈ 37.7 cm
6.Find the area of a semicircle with a radius of 8 cm, correct to 1 decimal place.

Answer: 100.5 cm2

  1. A = ½ × π × r2 = ½ × π × 64
  2. ≈ 100.5 cm2
7.A circle has a radius of 19 cm. Find its circumference, correct to 1 decimal place.

Answer: 119.4 cm

  1. C = 2 × π × r = 2 × π × 19
  2. ≈ 119.4 cm
8.A circle has a radius of 14 cm. Find its area, correct to 1 decimal place.

Answer: 615.8 cm2

  1. A = π × r2 = π × 142 = π × 196
  2. ≈ 615.8 cm2
9.A circle has a radius of 20 cm. Find its circumference, correct to 1 decimal place.

Answer: 125.7 cm

  1. C = 2 × π × r = 2 × π × 20
  2. ≈ 125.7 cm
10.Find the area of a semicircle with a radius of 11 cm, correct to 1 decimal place.

Answer: 190.1 cm2

  1. A = ½ × π × r2 = ½ × π × 121
  2. ≈ 190.1 cm2
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