Question

A toy is in the form of a cone mounted on a hemisphere of common base radius 7 cm. the total height of the toy is 31 cm. find the total surface area of the toy

Answer 1

CSA of cone = πrl 
=(22/7)(7)(√(r²+h²))
=(22)(√7²+(31-7)²)
=(22)(√49+576)
=(22)(√625)
=(22)(25)
=550 cm²
CSA of hemisphere=2πr²
=2(22/7)(7²)
=(44/7)(49)
=(44)(7)
=308 cm²
Therefore, total surface area of the toy = CSA of cone + CSA of hemisphere
=550+308
=858 cm²

Answer 2

around 660cm. square