the surface area of a sphere is 154 sq.m it is divided into two hemi spheres. find total surface areas of both the hemispheres.
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TSA of sphere= 154
=> 4 πr^2 = 154
=> 88r^2/7 = 154
=> r^2 = 7 *7/ 4
Radius of sphere= 7/2 cm
Radius of hemisphere= 7/2 cm
TSA of each hemisphere= 3πr^2
= 3×22×49/7×4
= 33×7/2
= 231/2
= 115.5 cm^2
=> 4 πr^2 = 154
=> 88r^2/7 = 154
=> r^2 = 7 *7/ 4
Radius of sphere= 7/2 cm
Radius of hemisphere= 7/2 cm
TSA of each hemisphere= 3πr^2
= 3×22×49/7×4
= 33×7/2
= 231/2
= 115.5 cm^2
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