Which equation correctly describes the relationship between the measures of the angles and arcs formed by the intersecting secants? m∠1=mab⏜+mcd⏜ m∠1=12mab⏜ m∠1=12(mab⏜−mcd⏜) m∠1=12(mab⏜+mcd⏜) circle with two chords. point a at 10 o clock, point c at 2 o clock, point d at 3 o clock, and point b at 8 o clock are on the circle. segment a d and segment b c intersect at a point. the angle made at the point of intersection of the two segments toward point a and b on the circle is labeled as 1.