33.Curved Surface area of a cone is 330cm 2 and its slant height is 21cm.
Find the radius of the base.
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Step-by-step explanation:
height of cone =21cm
curved surface area of cone =330cm²
πrl=330cm²
22/7 × r × 21=330 cm²
r= 7 ×330 / 22 =105
radius =105
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