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Adjustable triangle: Find the Missing Angle

Find the missing angle

1. Adjust the size and shape of the triangle by moving points A, B, or C. 2. With B and C showing, calculate the measure of the missing angle 3. Click on "Show Angle A" to see if you are right. Continue this process until you are certain you can find a missing angle.

How do you find the missing angle? What is your process?

What if only 1 angle were shown, could you find the other two? Explain your thinking.