Question, help me please! (1 Viewer)

[long jetty]

How do you work out this?

25 = Pi x r² x 2.5http://www.emsisoft.com/en/software/free/

Thanks anyone who can help!

 

[pLuvia]

You are trying to find r I presume?
25=pi*r²*2.5
25/2.5=pi*r²
10=pi*r²
10/pi=r²
r=+sqrt{10/pi}

 

[long jetty]

r² =

25
----
25 x Pi


r = Square root of:

25
----
25 x Pi

= 1.784 rounds off to 2

Is that correct, i'm really not sure what i'm doing