Question 69726
angle C is 72 deg, angle B is 90, BC is 5, and AB is app 15.39. using either tan, cos or sin, i have to find the hypotenuse, 
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Draw and picture; label the angle and side values.
You say AB is approximately 15.39; if that is its
actual value sin72 = 15.39/hyp
Then hyp = 15.39/sin72
hyp = 16.18...
Cheers,
Stan H.