Question

A cubical block of side 7 cm is surmounted by a sphere what is a greater diameter of hemisphere can have. find the surface area of the solid and give the figure

Answer 1

Answer:

332.5 square cm

Step-by-step explanation:

Solution: The greatest diameter = side of the cube = 7 cm

Surface Area of Solid = Surface Area of Cube – Surface Area of Base of Hemisphere + Curved Surface Area of hemisphere

Surface Area of Cube    =6*side*side

i.e.,=6*7*7=294 square cm

Surface Area of Base of Hemisphere =pi*r*r

=3.14*3.5*3.5=38.5 square cm

Curved Surface Area of Hemisphere  = 2*38.5 square cm = 77 square cm

Total Surface Area  = 294-38.5+77=332.5 square cm