Question

The solid sphere of diameter 17.5 CM cut out in two equal halves what will be the increase in centimetres square total surface area

Answer 1

Since the sphere is cut in two equal halves, we will get two hemispheres. Combined C.S.A. of two hemispheres will be equal to T.S.A. of sphere. Therefore, combined area of plane sides of hemispheres is added.
Therefore, increase
$= 2(\pi {r}^{2} )$
$= 2( \frac{22}{7} \times 8.75 \times 8.75)$
$= 2(240.625)$
$= 481.25 \: {cm}^{2}$