Question

A toy is in the shape of a right circular cylinder with the hemisphere on one end and a cone on the other, the radius and height of the cyclindercial part of the hemisphere and conical parts are the same as that of the cyclinderical part find the surface area of the toy if the total height of the toy is 30cm

Answer 1

Answer:

Height of the cylindrical part =13cm

Radius of cone , cylinder and hemi sphere=5cm

r=5cm for hemisphere cylinder and cone.

Height of cone h=30−5−13=12

The area of canvas required=Surface area of hemishphere,cylinder and cone parts of tent

A=2πr

2

+2πrH+πr(

h

2

+r

2

)

A=2π×5×5+2π×5×13+π×5(

5

2

+12

2

)

A=770cm

2