Help will give brainlest

Mathematics

1 answer:

Marrrta [24]3 years ago

7 0

The graph is wrong and can be subject to misinterpretation as the values in the graph don't add up to 100

63+80+70 is equal to 213

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$\cos^{-1}\left( \frac{180^2+160^2-140^2}{2\times180\times160} \right)=\cos^{-1}\left( \frac{32,400+26,600-19,600}{57,600} \right) \\ \\ =\cos^{-1}\left( \frac{39,400}{57,600} \right)=\cos^{-1}(0.6840)\approx47^o$