What word best describes the slope of the line passing through points (5,12) and (5,-13

The formulat for finding the slop is

m = (y2 - y1)/(x2 -x1)

so if we put the values of our two given points

m = (-13 -12) / (5 - 5)  = -25/0 = undefined

so our slop is undefined which means it is a vertical line

< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

⭐dhruv⭐

answer: howdy

step-by-step explanation: