Mrs.D Math · 7th Grade

CIRCLE
SPLASH

Circles Word Problems
C = πd = 2πr
A = πr²
π ≈ 3.14
◯ Circumference
▣ Area
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📚 Circle Word Problems

Circumference (given d)

C = πd   Use when diameter is given.

d = 10 → C = 3.14 × 10 = 31.4

Circumference (given r)

C = 2πr   Use when radius is given.

r = 5 → C = 2 × 3.14 × 5 = 31.4

Area

A = πr²   If given diameter, find r = d ÷ 2 first.

d = 10 → r = 5 → A = 3.14 × 5² = 3.14 × 25 = 78.5

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