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Mathematics 13 Online
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.

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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