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Mathematics for IGCSE & O level - Mensuration (Section 4 - No. 25)
How do you find the circumference of a circle if you only know the radius?
C = π * r²
C = 2 * π * r
C = 2 * r
C = 2 * π
Paaiškinimas
The circumference is 2 * pi * the radius.
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