The total surface area of hemisphere with base area 77 cm square is?
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Area of base = 22/7r²
77 =22/7×r²
r²=77×7/22
r²=7×7/2
r²=49/2
Total surface area of hemisphere
=3×22/7r²
=3×22/7×49/2
3×11×7
=231cm²
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