(6) 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 of the paper glass
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Answer:
Radius r=7cm
Height h=24cm
To find slant height l
l
2
2
=r
2
+h
2
l
2
=7
2
+24
2
l
2
=625
l=25cm
Curved surface area of cone is πrl
=
7
22
×7×25
=22×25
=550cm
2
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