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CassidyCat
The square root of 20? You'd use Pythagorean Theorem. 
What we need to do first is measure BC and CA.

As we can see BC measures 2, and CA measures 4.

So [tex] 2^{2} [/tex] and [tex] 4^{2} [/tex] give us 20.

And we square root that, and we get: [tex] \sqrt{20} [/tex].

So the answer is: [tex] \sqrt{20} [/tex].

Hope this helped! c:

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