Question

an edge of a cube is increased by 10% find a percent by which the surface area of cube increase

Answer 1

here is ur anwer;;bro 

Let, the edge of the square = 100

Increased by 10%

therefore, New edge will be 110

Surface Area of a square = 6 * (100)^2

                               = 60000

 Surface area of square with new edge = 6*(110)^2

                                          = 72600

 % increased in surface area = [(72600 - 60000)/60000] * 100

         =21% ans

Answer 2

original surface area is 6a2
new surface area is 6(11a/10)2= 121×6a2/100= 726a2/100
required percent = 1.26%