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OpenStudy (anonymous):
If angle ADB=70 degrees, what is the meas. of angle ABD=? arc of AB=? meas. of arc AD=? Refer to picture below.
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OpenStudy (anonymous):
Directrix (directrix):
*Arc AB has measure 140* because the inscribed angle that cuts off the arc has measure 70 and an inscribed angle is half its arc. Arc DAB is a semicircle so arc AD has measure 180 -140 = 40. M<ABD = 1/2 (40) = 20
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