To find a side given 2 sides and the angle between them
Find x
Using the cosine rule: a2 = b2 + c2 − 2bc cos A
y2 = 52 + 72 − 2 x 5 x 7 cos 49
y2 = 25 + 49 − 70 cos 49
y2 = 28.08
y = 5.3 (to 2 sig. fig.)
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