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Sine Opposite Hypotenuse Cosine Adjacent Hypotenuse Tangent Opposite Adjacent
Use the cosine law . And smarten up
soh cah toa, so adjacent over hypotenuse, or 8/10
use cosine law ,as robert136 said :\[b^2+c^2-a^2=2bc \cos (A)\\8^2+10^2-7^2=2(10)(8)\cos (\theta)\] can you go on
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