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Calculate the circumference and area of circles · Grade 7 · E2.3, E2.5

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Date: ______________________

1
A circle has a diameter of 6 cm. Using π ≈ 3.14, find its circumference in centimetres.
Warm-up
Answer:
2
A circle has a diameter of 6 cm. Using π ≈ 3.14, find its circumference in centimetres.
Warm-up
Answer:
3
A circle has a diameter of 6 cm. Using π ≈ 3.14, find its circumference in centimetres.
Warm-up
Answer:
4
A circle has a radius of 10 cm. Using π ≈ 3.14, find its circumference in centimetres.
On level
Answer:
5
A circle has a radius of 8 cm. Using π ≈ 3.14, find its circumference in centimetres.
On level
Answer:
6
A circle has a radius of 5 cm. Using π ≈ 3.14, find its circumference in centimetres.
On level
Answer:
7
A circle has a radius of 3 cm. Using π ≈ 3.14, find its area in square centimetres.
Challenge
Answer:
8
A circle has a radius of 6 cm. Using π ≈ 3.14, find its area in square centimetres.
Challenge
Answer:
9
A circle has a radius of 11 cm. Using π ≈ 3.14, find its area in square centimetres.
Challenge
Answer:

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Worksheet code: eyJzIjoic3BhdGlhbC1jaXJjbGUtbWVhc3VyZSIsImQiOlsxODc2NjIxNzM5LDEyOTQ4MTY1NDMsODQxMzQ1ODI1LDE0NjcwODIzMjAsMTAwMTE5MzkxNywxMjYxNTIxNzQzLDI3MDEyMDEyOCw0MjU0MDIyNDQsNjU1OTk4ODEyXSwidiI6MX0.ba327fb47bbe

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Answer key · Calculate the circumference and area of circles

1.
18.84 — C = π × d = 3.14 × 6 = 18.84 cm.
2.
18.84 — C = π × d = 3.14 × 6 = 18.84 cm.
3.
18.84 — C = π × d = 3.14 × 6 = 18.84 cm.
4.
62.8 — C = 2 × π × r = 3.14 × 20 = 62.8 cm.
5.
50.24 — C = 2 × π × r = 3.14 × 16 = 50.24 cm.
6.
31.4 — C = 2 × π × r = 3.14 × 10 = 31.4 cm.
7.
28.26 — A = π × r² = 3.14 × 9 = 28.26 cm².
8.
113.04 — A = π × r² = 3.14 × 36 = 113.04 cm².
9.
379.94 — A = π × r² = 3.14 × 121 = 379.94 cm².