On decreasing the radius of circle by 30%its area is decreased by howmuch
Answer»
Area of a circle is original area = pi*r^2 now as suggested the radius is reduced by 30% newr = r - rx30/100 r(1-0.3) = 0.7r calculating the area with the new radius GIVES pi*49r^2 original area = pi*r^2 LOSS in area = MODIFIED - original/original (49*pi*r^2 - pi*r^2 / pi*r^2)*100 (-51pi*r^2 /pi*r^2)*100 = -51% (since loss, the RESULT is negative) implies there would be a 51% loss in the area