Calculate the value of h, when S=198 and r=3.5 (Take π to be 227).
2.5
5.5
9
7.2
A
7.2
B
9
C
2.5
D
5.5
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Solution
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Given, S=198,r=3.5 Since, Total surface area of cylinder (S)=2πrh+2πr2 ⇒198=2πr(h+r) ⇒198=2×227×3.5(h+3.5) ⇒198=2×227×3510(h+3.5) ⇒198=22(h+3.5) ⇒19822=h+3.5 ⇒9=h+3.5 ⇒h=9−3.5=5.5
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