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Zackery
Mathematics
14 January, 22:48
How do you find a angel when you know the sides?
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Ava Waller
14 January, 22:57
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use The Law of Cosines first to calculate one of the angles
then use The Law of Cosines again to find another angle
and finally use angles of a triangle add to 180° to find the last angle.
cos (C) = (a2 + b2 - c2) / 2ab
cos (A) = (b2 + c2 - a2) / 2bc
cos (B) = (c2 + a2 - b2) / 2ca
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Alena Cohen
14 January, 23:16
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Lets say its a right angle : we know that it is 90 degrees
Since triangles are congruent to each triangle, each triangle has half as many degrees, namely 180. So this is true for any right triangle.
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