What is the area of a circle that has a diameter of 4.2 cm?

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Answer 1 · 2018-07-31T13:25:13

Area of a circle

#A=pitimes(D^2)/4#

D is the diameter

#A=3.14times(4.2^2)/4 = 13.85# #cm^2#

Your answer is #13.85# #cm^2#

Answer 2 · 2018-07-31T13:38:43

Area of circle #A = 13.86 # #cm^2#

Area of circle #A = pi r^2#

Radius (r) = Diameter (d) / 2

Given #r = d / 2 = 4.2 / 2 = 2.1 cm#

#Area = A = pi r^2 = pi * 2.1^2 = (22/7) * 2.1^2 = 13.86 cm^2#