**How it works ?**

In the applet below, use **INVERSE TRIGONOMETRIC FUNCTIONS** to write **EXACT EXPRESSIONS** for the measures of the acute angles (** A **and

*) in the*

**B****right triangle displayed.**

** ** Be sure to enter **EXACT VALUES** (and not decimal approximations).

For example, to input the expression * arcsin(sqrt(13)/5)*, simply enter “arcsin(sqrt(13)/5)” — without the quotation marks.

**KEY: **

arcsin(…. means ARCSINE OF….

arccos(…. means ARCCOSINE OF…

arctan(… means ARCTANGENT OF…

sqrt(… means SQUARE ROOT OF…

** You should be able to write the measure of each angle in 3 DIFFERENT WAYS. **To clear any entered expression at any time, simply click the **“Reset Answer”** button.

**If you enter a correct expression for any angle, the applet will indicate this to you.**