The highest common factor of 51 and 87?

3

Step-by-step explanation:

3

The factors of 51 are 1,3,17,51; The factors of 87 are 1,3,29,87

Hope this helps =]

what do you need me to answer?

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⭐