Question

Diameters of two circles are 12 and 5 respectively, what is the average of their areas?

Answer 1

Diameter of 1st circle = 12
radius = 6
Area of 1st circle = 3.14×6×6
= 113.04 ........(1)

Diameter of 2nd circle = 5
radius = 5/2 = 2.5
Area of 2nd circle = 3.14×2.5×2.5
= 19.625 ......... (2)

Average (total) of their areas = 1st circle + 2nd circle

from equ. (1) and (2)
= 113.04 + 19.625
= 132.665