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Two-Secant Angle Theorem:

measure of Angle B = 1/2 (arc ADC - arc EF)

m∠B = 1/2 (160° - 80°)

m∠B = 1/2 (80°)

**m∠B = 40°**

measure of Angle B = 1/2 (arc ADC - arc EF)

m∠B = 1/2 (160° - 80°)

m∠B = 1/2 (80°)