What is the area of a circle with a diameter of 7 cm?

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Answer 1 · 2015-08-01T15:27:28

#approxcolor(blue)(38cm^2#

The area of a circle is given by formula:
#color(blue)(pir^2#

Where,
#pi# has a constant value of #approx3.14#
and #r# denotes the radius.

The radius of the circle is half the diameter #=d/2 = 7/2 = 3.5cm#

The area #= pir^2 approx 3.14 xx (3.5)^2#

#=3.14 xx (12.25)#

#=38.465 # #cm^2#

#approxcolor(blue)(38cm^2#