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प्रश्न
A geyser is cylindrical in shape whose diameter is 28 cm and height 1.5 m. Neglecting the thickness of its walls, calculate its outer curved surface area.
बेरीज
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उत्तर
Given:
Diameter = 28 cm ⇒ radius r = 14 cm.
Height = 1.5 m = 150 cm.
take π = `22/7` for exact arithmetic
Outer curved surface area (L.S.A.) = 2πrh = 2 × `22/7` × 14 × 150
= 4200π cm2
= 2 × `22/7` × 14 × 150
= 13200 cm2
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