How do i create a scale of a drawing

use lines

Step-by-step explanation:

use lines from each point

70

step-by-step explanation:

2*5=10

4*15=60

60+10=

70

< 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⭐