Question

12. A solid cylinder has total surface area of 462 cm. Its curved surface
of its total surface area. Find the radius and height of the cylinder
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Answer 1

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Answer 2

$\huge{\mathfrak{\red{Answer}}}$

Curved surface area = total surface area / 3.

Curved surface area = 462/3 = 154.

Rest of area = 462 - 154 = 308.

$\longrightarrow$2πr^2 = 308.

$\longrightarrow$r^2 = 308 x 7 / 44 = 49.

• r = 7.

2πrh = 154.

• h = 154 / 2 x 22 = 7/2.