Chau started a test at 8:47 AM and finished it at 9:12 AM. How long did it take him? Give your answer in minutes.

25 mins

Step-by-step explanation:

8:47 to 9:00 is 13 min

9:00 to 9:12 is 12 min

13+12=25

25 mins

Hope this helped!

< 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⭐