# Slope Triangle Rotation (VA)

- Author:
- Tim Brzezinski

Interact with the applet below for a few minutes.
Then answer the questions that follow.

*Since*

**a**and**b**represent lengths of segments, their values are non-negative! Keep this in mind as you answer the questions below.## 1.

What is the slope of line j? Write this slope in terms of **a** and **b**.

## 2.

What is the measure of the **gray angle**? How do you know this?

## 3.

What is the sum of the measures of the **blue acute angle** and **pink acute angle**? Explain how you clearly know this to be true.

## 4.

What is the slope of line k in the applet above? Write this slope in terms of **a** and **b**.

## 5.

What can you conclude about 2 (non-horizontal & non-vertical) perpendicular lines drawn in the coordinate plane?