opposite/hypotenuse - Sin A, adjacent/hypotenuse - Cos A, opposite/adjacent - Tan A, sin⁻¹(o/h) - measure of angle A (using sin), cos⁻¹(a/h) - measure of angle A (using cos), tan⁻¹(o/a) - measure of angle A (using tan), longest side in a right angled triangle, across from the right angle - hypotenuse, across from the angle involved - opposite, beside the angle involved - adjacent, a² + b² = c² - Pythagoras' Theorem, equal to the sum of the squares of the opposite two sides  - the square of the hypotenuse, looking up from the horizontal - angle of elevation, looking down from the horizontal - angle of depression,

Trigonometry JC

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