An architect is planning security lights for the outside of a circular stadium. He wants each light to illuminate the stadium so that. What is the measure in degrees of \angle XYZ?

15

step-by-step explanation:

< 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: -8.2562234e+13

is there any photos or whatever?