A cone has a circular base of radius 10 cm &slant height of 30 cm. Calculate the surface area.
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take , radius be r= 10cm
slant height be l= 30cm
surface area of cone= πr(l+r)
=> (22/7)*10*[30+10] cm²
=> (220/7)*[40] cm²
=> 8800/7 cm²
slant height be l= 30cm
surface area of cone= πr(l+r)
=> (22/7)*10*[30+10] cm²
=> (220/7)*[40] cm²
=> 8800/7 cm²
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