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Substitution Property of Equality

If an angle is an inscribed angle, then its measure is equal to half the measure of the intercepted arc.

If an angle is a central angle, then its measure is equal to the measure of the intercepted arc.

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Given circle A, show that m∠DEB = 1 over 2 1 2 m∠DAB.
m∠DAB = m
DB
m∠DEB = 1 over 2 1 2 m
DB
m∠DEB = 1 over 2 1 2 m∠DAB
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