Question

a cylinder which is open at one end has a radius of 6.3cm and a height of 25cm.What is the surface area of the cylinder in square centimeters. i need step by step explanation.

Answer 1

total surface area of cylinder is 2πr(h+r)

r, radius = 6.3

h, height = 25cm

=> $2 * \frac{22}{7\\} * \frac{63}{10} ( 25 + 6.3)$   { taking 6.3 as 63/10 }

=> $2 * \frac{22}{7} * \frac{63}{10} ( 31.3)$

=> $2 * \frac{22}{7} * \frac{63}{10} * \frac{313}{10}$

=> $\frac{2 * 22 * 9 * 313}{10}$

=>$\frac{123948}{100}$

=> 1239.48$cm^2$

the total surface area is  1239.48$cm^2$.

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