Question : The total surface area of a right circular cylinder with a radius of the base 7 cm and height 20 cm, is:
Option 1: 900 cm2
Option 2: 140 cm2
Option 3: 1000 cm2
Option 4: 1188 cm2
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Correct Answer: 1188 cm 2
Solution :
Given: Radius, $r$ = 7 cm
Height, $h$ = 20 cm
we know that,
Total surface area of right circular cylinder = $2\pi r(h+r)$
= $2 × \frac{22}{7}×7(20+7)$
= 2 × 22 × 27
= 1188
Hence, the correct answer is 1188 cm
2
.
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