If the total area of hemisphere is 115.5cm² then the diameter is ___cm
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3πr^2= total surface area of hemisphere
ATQ,
3πr^2=115.5cm^2
r^2= 115.5/(3π)
=12.5cm
r = √12.5
=1.5cm
Diameter= 1.5×2= 3.0 cm
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