Question

If the radius of the base of a hemisphere is
doubled, then find the ratio of the total surface
area of the new hemisphere to that of the original
hemisphere.

Answer 1

Answer:

4:1

Step-by-step explanation:

let the radius be r

Increased radius = 2r

Original surface area = 3πr²

Increase surface area = 3π (2r)² =12πr²

Reguored ratio= 12πr²:3πr²

=12πr²/3πr²=4/1=4:1

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