Question

http://prntscr.com/ama3yc
Tri quesiton.

Answer 1

the diagonal of a square is the length of the side of the square times \(\sqrt2\)

Answer 2

comes directly from pythagoras \[a^2+a^2=c^2\\
2a^2=c^2\\
\sqrt{2a^2}=c\\
a\sqrt2 = c\]

Answer 3

@satellite73

Can you explain the last step of that?

How did

Turn into

Also, I'm not sure where I'm supposed to plug in the area in all this