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# help on my math homework?

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- MichaelLv 75 years agoBest Answer
Theorem: The measure of the angle formed by two chords that intersect inside the circle is ½ the sum of the chords' intercepted arcs.

4x = (1/2)(120 + 2x)

4x = 60 + x

3x = 60

x = 20

AEC = 4x = 4*20 = 80

AEC = 80º

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