Question

a dustbin is in the shape of a cylinder with hemispherical depression at the top the height of the cylinder is 2 m and its radius is 60 cm find the TSA of the dustbin​

Answer 1

Answer:

total surface area = area of base of dustbin + area of the hemispherical depression + curved surface area of cylindrical part

πr² + 2πrh +3πr²

= 2πr ( h + 2r )

= 2 × 22/7 × 0.6 ( 2 + 2×0.6)

= 12.063 m²

Answer 2

Answer:

Let r

1

=15 cm,r

2

=8 cm and h=63 cm

Volume of the dustbin (frustrum)=

3

1

×π×h×(r

1

2

+r

2

2

+r

1

r

2

)

=

3

1

×

7

22

×63×(15

2

+8

2

+15×8)

=66(225+64+120) cm

3

=66×409 cm

3

=26994 cm

3