Dameter of top of a frustum shaped paper glass is 7 cm and its base
diameter is 4.9 cm. Slant height of the glass is 7.5 cm. Find the curved
surface area of the paper glass.
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Answer:
Radius r = 7 cm
Hight h = 24 cm
To find slant height l = l² = r² + h²
l² = 7² + 24²
l² = 49 + 576
l² = 625
l = √625
l = 25
Curved surface area of cone is = πrl
22/7 × 7 × 25
22 × 25
550 cm³ ans
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