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A right angle triangle has three sides and three interior angles one of which is 90 degrees. The names of its sides are the adjacent the opposite and the hypotenuse and using the 3 trig ratios we can find the interior angles or lengths of the sides depending on the information given.

Tangent angle = opposite/adjacent

Sine angle = opposite/hypotenuse

Cosine angle = adjacent/hypotenuse

If we are given the lengths of 2 sides we can work out the angles with the above ratios.

If we are given a length and an angle we can work out the lengths of the other 2 sides by rearranging the above ratios.

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14y ago

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