How can you find the radius of a circle from the area?

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Answer 1 · 2018-03-27T14:47:14

Use formula of area of circle

Area of a circle =#piR^2#
Plug in values and solve for #R#

#R=sqrt("Area"/pi)#

Answer 2 · 2018-03-27T15:16:08

See explanation below

Example:-

Area of a circle#=pir^2#

If the area#=15 cm^2#

#:.pir^2=15#

#:.r^2=15/pi#

#:.sqrt (r^2)=sqrt(15/pi)#

#:.r=sqrt(15/pi)#

#:.r=sqrt(4.774648293)#

#:.r=2.185096861cm# or # 2.2cm#

~~~~~~~~~~~~~~~~~~~~~~

check:-

#:.pir^2=15#

#:.pi=15/2.185096861^2#

#:.pi=15/4.774648292#

#:.pi=3.141592654#