1. 2.
Calculate 79.18 - 2.6, correct to 3 de
3.
Calculate 1
-Źx4, without a calcula
One evening the temperature was 2°
10°C. Write down the temperature at midnight

< 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⭐