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The sides of a triangle r 6 7 and 8 cm. Find the size of the smallest angle?
Wiki User
∙ 15y ago
Let the angle opposite to the side of 6 be C, then
cos C = (7^2 + 8^2 - 6^2)/(2 x 7 x 8)
cos C = 77/112
cos C = 0.6875
m of C = arc cosine(0.6875) = 46.57 degrees
Wiki User
∙ 15y ago
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