CPM Homework Help : CCG Problem 5-30

Use two different trig ratios to find the measure of $∠A$ . Did you get the same answer both ways?

A right triangle with base of 5, height of 12, and hypotenuse of 13. Angle A is opposite side, 12.

Hint 1:

Review the Math Notes box in Lesson 5.1.2.
With three known side lengths does it matter which trig ratio you use?

Hint 2:

Remember when finding an angle measure you need to use inverse trigonometry.