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If you know the diameter of a circle, how do you find its circumference? A) Multiply the diameter by π. B) Multiply the diameter by 2π. C) Square the diameter and multiply by π. D) Divide the diameter in half and multiply by π.

Respuesta :

tonb
The diameter is [tex]2r[/tex], and the circumference is [tex]2\pi r[/tex], so to get from one to the other you just have to multiply by pi.

That's answer A.