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.
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If the direction of A with respect to B changes, angle ABC changes. The angle increases or decreases depending on the location of point A. This assumes BC is fixed. The measure of angle ABC equals 0° when A becomes a point on CB. In other words, no motion is necessary to turn AB onto BC in this case.
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