What is the slope of this line?
3/2 2/3 -3/2

answer: both chords and diameters have two endpoints on a circle. diameters must intersect the center of a circle.

m∠5 + m∠3 = m∠1   is true.

m∠5 + m∠6 = 180 is true

m∠2 +m∠3 = m∠6   is true

m∠2 +m∠3 +m∠5 = 180   is true