Question

The radius of one sphere is twice as great as the radius of another sphere. Find the ratio of their surface areas.

Answer 1

Why don't you take a radius of 1 and a radius of 2 and then compare their surface areas? :)

Answer 2

\( \color{Black}{\Rightarrow Area(Sphere ) = 4\pi r^2 }\)

Answer 3

I tried that. I got 1:4.

Answer 4

\( \color{Black}{\Rightarrow \textbf{Radius of 1}: 4\pi r ^2 \Longrightarrow 4\pi }\)
\( \color{Black}{\Rightarrow \textbf{Radius of 2}:4\pi r^2 \Longrightarrow 16\pi }\)
1:4 is correct~!

Answer 5

Thanks!! :) :) :)