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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 4 cm. Using π ≈ 3.14, find its circumference in centimetres.
Warm-up
Answer:
2
A circle has a diameter of 4 cm. Using π ≈ 3.14, find its circumference in centimetres.
Warm-up
Answer:
3
A circle has a diameter of 14 cm. Using π ≈ 3.14, find its circumference in centimetres.
Warm-up
Answer:
4
A circle has a radius of 8 cm. Using π ≈ 3.14, find its circumference in centimetres.
On level
Answer:
5
A circle has a radius of 4 cm. Using π ≈ 3.14, find its circumference in centimetres.
On level
Answer:
6
A circle has a radius of 6 cm. Using π ≈ 3.14, find its circumference in centimetres.
On level
Answer:
7
A circle has a radius of 8 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: eyJzIjoic3BhdGlhbC1jaXJjbGUtbWVhc3VyZSIsImQiOlsxMzY4NDUzODE5LDE1NjM3MTQzNTgsMTM0OTY2NzUxMywxMDMxMTA0ODYzLDE3MjQzMzk3MzQsMTMyNTY3MjI0LDMwOTIyNDE2NiwxMDkyMDUyMzkyLDE2Mzg1MTk2NTJdLCJ2IjoxfQ.006b791b2aab

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Answer key · Calculate the circumference and area of circles

1.
12.56 — C = π × d = 3.14 × 4 = 12.56 cm.
2.
12.56 — C = π × d = 3.14 × 4 = 12.56 cm.
3.
43.96 — C = π × d = 3.14 × 14 = 43.96 cm.
4.
50.24 — C = 2 × π × r = 3.14 × 16 = 50.24 cm.
5.
25.12 — C = 2 × π × r = 3.14 × 8 = 25.12 cm.
6.
37.68 — C = 2 × π × r = 3.14 × 12 = 37.68 cm.
7.
200.96 — A = π × r² = 3.14 × 64 = 200.96 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.