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A wooden article was made by …

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A wooden article was made by scooping out a hemisphare from each end of a cylinder , as shown in the figure . If the height of the cylinder is 20cm and its base is of diameter 7cm, find the total surface area of the article when it is ready.

Posted by Prakash Thakur 6 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 6 years, 6 months ago

TSA of the article = 2{tex}\pi{/tex}rh + 2(2{tex}\pi{/tex}r²)
= 2{tex}\pi{/tex} (7)(20) + 2[2{tex}\pi{/tex} (7)²]
= 280{tex}\pi{/tex} + 98{tex}\pi{/tex}
= 378{tex}\pi{/tex}
= 378{tex}\times{/tex} {tex}\frac {22}7{/tex}
= 1188 cm²

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CBSE > Class 10 > Mathematics