Delete and focus on the intersection of and . Keeping points B and C fixed, move point A to different locations and observe how changes. What must you do to increase or decrease ? What happens if you move point A to a location directly on ? What is at this location? Explain.

Following are the solution to this question:

Explanation:

When B is changing the direction of A, its angles of ABC are modified. Depending on the direction of position A inclination increases and decreases. It also implies that BC will still be in place. When A is a point on CB, that angle measurement ABC is equal to 0°. In several other words, in this case, there is no need to move AB into BC.