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kobusy [5.1K]
3 years ago
15

A company manufactures exercise balls for gyms. Type A is a spherical ball with a radius of 12 inches. Type B is a hemisphere th

at will remain stationary when placed on its base. The radius of the hemisphere is also 12 inches. What is the ratio of the surface area of the sphere to the surface area of the hemisphere?
Mathematics
2 answers:
Readme [11.4K]3 years ago
5 0
We know that
[surface area of sphere]=4πr²
[surface area of hemisphere]=2πr²

 (sphere)
r=12 in
[surface area of sphere ]=4π12²--------> 576π in²

(hemisphere)
r=12 in[surface area of hemisphere ]=2π12²--------> 288π in²

[the ratio of the surface area of sphere to the surface area of hemisphere]
=576π/288π-------> 2

the answer is
the ratio is 2
viktelen [127]3 years ago
3 0

Answer:

the answer on edge is 4 : 3

Step-by-step explanation:

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A lighthouse keeper has a 10 degrees angle of depression between the horizontal light beam and the line of sight from the ship.
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3 years ago
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Step-by-step explanation:

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Step-by-step explanation:

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