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14 August, 02:53

9^2 = 9.5^2 + 4^2 - 2 (9.5) (4) (cosR)

I'm trying to find out the angle measure of R

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  1. 14 August, 06:28
    0
    Sorry I can't solve it.

    Firstly, the equation is wrong. It is supposed to be 81 ≠ 30.25

    Second of all, this is the best I got 81 = - 76 (cos (r) + 106.25
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