Find X?

Geometry Level 3

Find X X to the nearest whole number.


The answer is 28.

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1 solution

Tushar Showrav
Apr 16, 2016

Using the law of cosines,

x^{2} = 21^{2} + 22^{2} - 2 21 22*cos 80 deg ,

x^{2} = 764.54
x = 27.65 = 28

Its better if you provide us with the value of cos 8 0 \cos 80^{\circ} .

Rishik Jain - 5 years, 1 month ago

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