# In a Geometry two column proof Prove: m( ∠ ABC) = 1/2 [ m(*arc*ADC) – m(*arc*AEC)] Look at picture below?

Given: Circle O with tangent lines AB and CB and secant BD
Hint:
POSTULATE 7.3= If A, B, and C are three points on the same arc, and B is between A and C then;
m(*arc*AC) = m(*arc*AB) + m(*arc*BC)
m(*arc*BC) = m(*arc*AC) - m(*arc*AB)
m(*arc*AB) = mm(*arc*AC) - m(*arc*BC)
THEOREM 7.7= The measure of an angle...
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Given: Circle O with tangent lines AB and CB and secant BD

Hint:

POSTULATE 7.3= If A, B, and C are three points on the same arc, and B is between A and C then;

m(*arc*AC) = m(*arc*AB) + m(*arc*BC)

m(*arc*BC) = m(*arc*AC) - m(*arc*AB)

m(*arc*AB) = mm(*arc*AC) - m(*arc*BC)

THEOREM 7.7= The measure of an angle formed by the intersection of a tangent and a secant outside a circle is equal to one-half the difference of the measures of the intercepted arcs

Hint:

POSTULATE 7.3= If A, B, and C are three points on the same arc, and B is between A and C then;

m(*arc*AC) = m(*arc*AB) + m(*arc*BC)

m(*arc*BC) = m(*arc*AC) - m(*arc*AB)

m(*arc*AB) = mm(*arc*AC) - m(*arc*BC)

THEOREM 7.7= The measure of an angle formed by the intersection of a tangent and a secant outside a circle is equal to one-half the difference of the measures of the intercepted arcs

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