A cone is made by rolling up a sector of radius 12cm and central angle 120
What is the base radius?
What is curved surface area?
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Step-by-step explanation:
Curved surface area of cone will be the 1/3 of area of circle because angle 120 is one third of 360.
therefore the required area is
=π×12×12/4
=36π
=36×22/7
=113.14 square cm...
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