### Home > PC > Chapter 6 > Lesson 6.2.2 > Problem6-84

6-84.

Below is a graph of a periodic function and the line $y = 5$. One of the intersection points is $\left(11.31, 5\right)$.

1. What is the period of the function?

2. Use the symmetry of the graph to find the coordinate of the intersection labeled as point $B$.

Set up an equation involving $B$.
$15 − 11.31 = B − 15$

3. What is the coordinate for the point labeled $C$?

Set up an equation involving $C$.
$11.31 − 5 = 5 − C$