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The trigonometric ratios is like the unit circle.. there are special angles like 0,30,45 and 60 degrees.

in 30 degrees

when you press in the scientificÂ calculator the sin30 degrees is 0.5 or one-half

cos30 over 2 and the tan30 is 1 over the square root of 3

in 30 degrees

when you press in the scientificÂ calculator the sin30 degrees is 0.5 or one-half

cos30 over 2 and the tan30 is 1 over the square root of 3