AB and CD are chords that intersect inside a circle.
a.if AD = 120° and BC = 50° find the measure of 1
b. if BD = 150° and AC = 70° find the measure of 2
c. if BC = 60° and the measure of 1 is 80°, find AD
d. if AD = 130° and the measure of 1 is 105° , find BC.
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