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

1 Answer
Aug 1, 2015

Answer:

#approxcolor(blue)(38cm^2#

Explanation:

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#