total surface area of a hemisphere of radius 7 cm is, ( take π =22/7)
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Total surface area of hemisphere = 4×22/7×r^2
=4×22/7×7×7
=4×22×7
=8×77
=616cm^2
=4×22/7×7×7
=4×22×7
=8×77
=616cm^2
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