Question

1. Find the curved surface area and total surface area of the solid cylinder of diameter
7 cm and height 12 cm.​

Answer 1

same answer

thanks for free fire points

Answer 2

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Explanation:

Given:

Diameter of Cyclinder =7cm

Height =12cm

To Find :

Find the curved surface area and total surface area of the solid cylinder of diameter

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Note : Diameter is twice of radius or radius is half of its diameter.

R=$\bold{ \frac{d}{2} = \frac{ \frac{7}{2} }{2} = \frac{7}{4} }$

∴Radius is 7/4cm

$\bold{\boxed{Curve \: Surface \: Area \: of \: Cylinder = 2\pi \: rh}}$

$= > 2 \times \frac{22}{7} \times \frac{7}{4} \times 20$

$= > \frac{44}{7} \times 7 \times 5$

$= > \frac{44}{7} \times 35$

$= > 44 \times 5 = 220 {cm}^{2}$

Curved surface area of cylinder is $\bold{\red{220 {cm}^{2} }}$

$\bold{\boxed{Total \: Surface \: Area \: of \: Cyclinder = 2\pi \: r(h + r)}}$

$2 \times \frac{22}{7} \times \frac{7}{4} (12 + \frac{7}{4} )$

$= > \frac{44}{7} \times \frac{7}{4} ( \frac{48 + 7}{4} )$

$= > 11( \frac{55}{4} ) = \frac{605}{4} = 151.25 {cm}^{3}$

∴Volume of cylinder is $\bold{\red{151.25 {cm}^{3}}}$

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