1. The total surface area of a hemisphere is $$1039.5 cm^2$$. Find its diameter (in cm).
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By: anil on 05 May 2019 02.03 am
Let radius of hemisphere = $$r$$ cm Total surface area = $$3pi r^2=1039.5$$ => $$3 imesfrac{22}{7} imes r^2=1039.5$$ => $$r^2=1039.5 imesfrac{7}{66}=15.75 imes7$$ => $$r=sqrt{110.25}=10.5$$ $$ herefore$$ Diameter = $$2 imes10.5=21$$ cm => Ans - (A)
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