How To Find Any Angle In Any Triangle Given All 3 Side Lengths (The Cosine Rule Angle Formula).
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How To Find Any Angle In Any Triangle Given All 3 Side Lengths (The Cosine Rule Angle Formula).
This video will show you how to use the cosine rule formula for finding an angle in a non right angled triangle. The formula to use is cosA = (b^2 + c^2 – a^2)/2bc. Notice that this is different from the standard formula of a^2 = b^2 + c^2 – 2bcCosA, as this formula is much easier to using when working out a missing angles. As with all ...
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