Question

Total surface area of a hemisphere is equal to the surface of a sphere, then the ratio of their radii is ?​

Answer 1

Answer:

The surface area of the sphere is 4πr2

The surface area of the hemisphere is equal to sum of the “curved” and “flat” areas (the curved area being half the surface area of the sphere, and the flat area of the sphere being equal to the area of a circle with radius r . The total area, then, is equal to 2πr2 + πr2 = 3πr2 .

The ratio, therefore, is 3:4.

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Answer 2

Total surface area of a hemisphere:

[A = 3 × π × r² ]

Surface to volume ratio of a hemisphere:

A / [V = 9 / (2 × r) ].

please substitute using those formulas as you didn't gave other values...