A right triangle is shown. What is cos A?

**Cosine of an angle is the ratio of the adjacent side to the hypotenuse.**

**adjacent**

------------ = cosine

hypotenuse

------------ = cosine

hypotenuse

Find the side adjacent to ∠A (next to angle A), and find the hypotenuse (side across from the right angle).

**8**

cos A = -----{adjacent over hypotenuse}

cos A = -----

**17**

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