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What is the law of sines? How do i find EF and CD?

Sorry, I didn't realize you don't know trig. In this case, use the Pythagorean theorm

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So, Side ED is 5 units long

FE would be 13.

and DC would be 13

Or, you could have used proportions. Since every triangle is the midpoint of another.

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I just need to find the measure of angle DCB

From what triangle?

CDB

That angle would be 22.89

But since you don't know trig, I don't know how to explain this to you using any ordinary method.

Ok. Well thanks man you saved me tonight.