Question

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❤️ A Question For U❤️

A wooden article was made by scooping out a hemisphere from each end of a cylinder. If the height of the cylinder is 20 cm and its base is of diameter 7 cm. Then find the Total surface Area of the article when it is ready....!!

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Answer 1

Hey!

If we consider a hemisphere is scooped out from cylinder.

Then it's total surface area will be

Curves surface area of cylinder +2*Total surface area of hemisphere

Curved surface area of cylinder=2*πrh
=439.82 cm^2


Curved surface area of hemisphere =2πr^2
= 2×π×3.5×3.5=76.96cm^2


so required surface area is =439.82+2×76.96
=593.74 cm^2

thanks !!

Answer 2

area of article=CSA of cylinder +2*csa of hemisphere

radius (r)=7/2cm

h(of cylinder)=20cm

c.s.a of cylender=2πrh
=2*(22/7)*(7/2)*20
=22*20
=440cm^2
radius of sphere=7/2cm
CSA of sphere=2πr^2
=2*(22/7)*(7/2)*(7/2)
=77cm^2
the area of article = CSA of cylinder +2*csa of hemisphere
=440+154
=594cm^2

$\purple{area \: of \: artile = 594cm^2}$
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