What are the dimensions of the circle? #Area = 64pi " in"^2#

Question

What is r?

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Answer 1 · 2018-02-24T04:48:53

#r= 8# in

#A=pi*r^2#

#64pi =pi*r^2#

Divide by pi on both sides
#64=r^2#

#r=8 and -8# but since distance can't be negative, the answer is just 8

Answer 2 · 2018-02-24T04:50:38

The primary dimensions of a circle are the radius, circumference and area. In this case, given the area we can calculate the radius to be:
#r = 8#

Area of a Circle = #A = pir^2#

#64pi = pir^2# ; #64 = r^2#; #r = 8#