Question

if each edge of a cube is increased by 50% find the percentage increase in the surface area ​

Answer 1

Let a= initial length of edge=1

A= final length of edge=1.5

S1=6a*a=6*1*1=6

S2=6*1.5*1.5=6*2.25

S2-S1=6(2.25-1)=6*1.25

%increase=(s2-s1)*100/s1

=6*1.25*100/6

=125%