Question

is there spare is cut into two equal parts its surface area will

Answer 1

Do you mean sphere? If so...

Let r= Radius of sphere,

Surface area of sphere=4*π*r^2

And Volume= 4/3*π*r^3

After cutting the sphere

New vol=2*1/2*(4/3*π*r^3)=4/3*π*r^3

No change in volume..

New surface area=2*circulars Area*curved spherical area=2*π*r^2+4*π*r^2=6*π*r^2

Change in surface area=50% increase due to cut.