ivan5237 ivan5237

17-08-2017
Mathematics

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if the area of a circle is 64 pi what is the diameter

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ghanami ghanami

18-08-2017

hello :
the area of a circle is : A = π × r² r : the raduis
the diameter is : d d= 2r
A = 64 π
64 π = π × r²
r² = 64
r = 8
d= 16

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