The external radius of a hollow hemisphere is 6 cm and it is of thickn – InterviewSolution

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1.	The external radius of a hollow hemisphere is 6 cm and it is of thickness 2 cm.What will be the whole surface area of the hemisphere?
Answer» The external radius of the hemisphere is 6 cm and the thickness of it is 2cm. `therefore` internal radius of the hemisphere =(6-2) cm =4 cm. `therefore` the whole surface area of the hemisphere lt brgt =`(2pixx6^(2)+2pixx4^(2)+pixx6^(2)-pixx4^(2))` sq.cm `= pi(2xx36+2xx16+36-16) ` sq.cm `=(22)/(7)xx(72+32+20) "sq.cm" =(22)/(7)xx124 "sq.cm"=(1728)/(7) "sq.cm"=389(5)/(7)`sq.cm. Hence the whole surface area of the hemisphere `=389(5)/(7)` sq,cm.

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