Atriangle has a side length of 15 inches and 30 inches. it also has angels that measures 45 and 20.which of the following identifies the possible third side length and third angle of the triangle?
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I am assuming that you will need to do Pythagorus Theorem to find the 3rd side length. If thats the case then you will need to do the following formula : a^2 + b^2 = √(c) 
So 15^2 + 30^2 = √(c)
= 33.5 inches

The third angle would be 115 because 180 - 45 - 20 = 115

I hope this helped.