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What is $\cos{30^{\circ}}$ in surd form?
in Grade 10 Maths by Diamond (40.2k points) | 24 views

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Using special angle values in a 30,60,90 degree angles triangle.

Lt the hypotenuse be 2x, adjacent be x√3  and the third side be x (from Pythagoras)

using trig ratios, cos 30 = adj/hyp = x√3/2x

                                                      =   √3/2
by Silver Status (31.3k points)

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