Question 607154
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Hi,
right Triangle, &#8736;A = 72° and &#8736;C = 90° and c = 15cm, Find b
cos 72 = b/15,  b = 15cos72 = 4.635
<img src=" http://upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Rtriangle.svg/200px-Rtriangle.svg.png ">