Q. 54.4( 87 Votes )

Answer :

Given:

Radius (*r*1) of upper circular end of frustum part = = 9 cm

Radius (*r*2) of lower circular end of frustum part = Radius of circular end of cylindricalpart = = 4 cm

Height (*h*1) of frustum part = 22 - 10 = 12 cm

Height (*h*2) of cylindrical part = 10 cm

Slant height (*l*) of frustum part

=

= 13 cm

Area of tin sheet required = CSA of frustum part + CSA of cylindrical part

= π (r1 + r2) * l + 2πr2h2

= (9 + 4) * 13 + 2 * * 4 * 10

= [169 + 80]

=

= 782 cm^{2}

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