Question

the ratio of the total surface of a sphere and a hemisphere of same radius is ...​

Answer 1

Answer:

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Step-by-step explanation:

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.

Answer 2

Answer:

4 : 3

Step-by-step explanation:

T. S. A of Sphere = 4* pi* r^2 .. (1)

T.S.A of hemisphere = 3 * pi * r^2 .. (2)

Divide (1) By (2)

= T. S. A of Sphere / T.S.A of hemisphere

= 4* pi* r^2/ 3 * pi * r^2

= 4 : 3

Hope it's helpful to u.