Answers

2014-11-25T21:43:23+05:30

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Diameter becomes (100% - 25%) = 75% of its previous value = 0.75D = 3D/4

curved surface area of a sphere  =  4π R² / 3  =>  π D² / 3
 new surface area                = (π/3)  (3D/4)² / 3
                       = 9/16 * πD²/3
   reduction in surface area =  πD²/3 - 9/16 * πD²/3
                           =  7/16 * πD²/3
   % decrease =  7/16 * 100       =    43.75%

0