an artist uses a scale of 3 inches : 4 feet for a scaled drawing of a billboard. Find the dimensions of the billboard if the drawing measures 15 inches by 9 inches

20 feet by 12 feet

Step-by-step explanation:

15/3 = 5 · 4 = 20

9/3 = 3 · 4 = 12

< 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⭐