Question

A cubical block of 7cm is surmounted by a hemispeher wht is greatest diameter the hemisphere can have? Find the surface area of the solid

Answer 1

Answer:

Step-by-step explanation:

Greatest diameter will be equal to side of cube i.e.7 cm.

Surface area of solid= total surface area of cube - area of one face of hemisphere + curved surface area of hemisphere

= 6a^2- πr^2 + 2πr^2

= (6×7×7)-(22/7×3.5×3.5)+(2×22/7×3.5×3.5)

= 294 - 38.5 + 77

= 332.5 cm^2