Question 23

Find the total surface area $$(in cm^2)$$ of a right circular cylinder of diameter 7 cm and height 6 cm.

Solution

Height of cylinder, $$h=6$$ cm and radius, $$r=\frac{7}{2}=3.5$$ cm

Total surface area of cylinder = $$2\pi r(r+h)$$

= $$2\times\frac{22}{7}\times\frac{7}{2}\times(3.5+6)$$

= $$22\times9.5=209$$ $$cm^2$$

=> Ans - (B)

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