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## Homework Statement

A triangle with a hypotenuse of 13.5 and height of 11.8. Find the measure of angle P.

Angle p is on the same line as the 90 degree angle and I found out that it must be sine.

## Homework Equations

sine = opposite/hypotenuse

## The Attempt at a Solution

sin p = 11.8/13.5

sin p = .874

Textbooks answer: sin p = 71.468

It says I need to use something called 2nd sine like this: 2nd sin(11.8/13.5), which I can't find on my calculator and hasn't been introduced in the textbook until now. It doesn't explain 2nd sin. What does it mean and how do I go about solving this on my own?