Question

find the curved surface area and total surface area of a cylinder, the diameter of whose base is 7cm and height is 60cm​

Answer 1

Answer:

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Answer 2

AnswEr:

$\sf{Given}$

• Diameter = 7cm
• Height = 60 cm

$\implies\sf\: Radius\:=\: \dfrac{Diameter}{2}$

$\implies\sf\: Radius = \dfrac{7}{2}$

$\dag\:\:\bold{\underline{\sf{Finding\: C.S.A\: of \: Cylinder}}}$

$\diamond\:\:\small\boxed{\sf{\red{C.S.A\:=\: 2\pi rh}}}$

$\implies\sf\: 2 \times \dfrac{22}{7} \times\dfrac{7}{2} \times 60$

$\implies\sf\bold {1320\: cm^2}$

$\rule{150}2$

$\dag\:\:\bold{\underline{\sf{Now,\:Finding\: TS.A\: of \: Cylinder}}}$

$\implies\sf T.S.A = C.S.A + 2 \pi r^2$

$\implies\sf 1320 + 2 \times \dfrac{22}{7} \times( \dfrac{7}{2})^2$

$\implies\sf 1320 + 77$

$\implies\sf\bold{1397 \:cm^2}$

$\rule{150}2$