Question

calculate the radius of a sphere having surface area 144 Pi square cm. find the surface area of the sphere having half the radius of the first sphere

Answer 1

the radius of the Sphere=108 cm.
half of the radius of the sphere=108/2
=54 cm
surface area of the new spere=4/3 πr³
=4/3×22/7×54×54×54
=88/7×18×54×54
=88/7×52488
=4618944/7
≈659849.14