1. Why do we use surveys and how are
they helpful? List 3 reasons, you
must include 1 not discussed in class.

< 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⭐

that is the sum

step-by-step explanation:

there are no other answers without knowing the variables values

there is no grid

step-by-step explanation:

the answer is the third / last answer

step-by-step explanation: