I have no idea how to do this. HELP!!

Question

tester97 · Answer

What is it that i may attempt to assist you with?

anonymous · Answer

I have no clue how to even start this let alone solve this. I'm completely lost

tester97 · Answer

Post your question and perhaps i may be of assistance

armyrangers · Answer

Ok so is the question so we can help you

anonymous · Answer

Can you see the attachment?

tester97 · Answer

no sorry

anonymous · Answer

anonymous · Answer

circle G and circle U are similar. find the value of X

anonymous · Answer

well we have s = 4 (pi) and the measure of the radius is 9
and you know that s = (radius ^2) x (pi) ?

anonymous · Answer

|dw:1405345521382:dw|

anonymous · Answer

what is S ?

anonymous · Answer

|dw:1405345561350:dw|

anonymous · Answer

isn't it r^2 x (pi) ?

anonymous · Answer

i think that is correct. i just started learning this today and im lostr on this concept entirely

anonymous · Answer

so we have r=9 so the whole S would be 81(pi)

anonymous · Answer

but in the figure the surface of a part of the circle was 4pi

anonymous · Answer

so
$$\frac{ 81 }{ 4 } = \frac{ Surface \  of  \ the  \ sircle }{ Surface \  of \ that \ part }$$

anonymous · Answer

okay so i think i got it... i ended up with 15 as my fina answer if i plugged everything in correctly

anonymous · Answer

so you know how to solve the question ?