If a diameter of cicle is increased by40% find by how much percentage

1.	If a diameter of cicle is increased by40% find by how much percentage its area increases
Answer» diameter = d=> radius = d/2new diameter = d + 40% of d = d + 2d/5 = 7d/5=> increased radius = 7d/10original area= 22/7 X d2 / 4 = 11d2 / 14increased area = 22/7 X 49d2/100 = 539d2 / 350increase = (539d2 - 297d2)/ 350 = 242d2/ 350= 121d2/ 165\xa0

Discussion