ivan5237 ivan5237
  • 17-08-2017
  • Mathematics
contestada

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

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ghanami
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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