Calculate the area of the classroom. area =l×b

length=160cm

breadth=100cm

area=l×b

=160×100

=16000cm^2

< 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⭐

i can't solve unless i know what the line is

step-by-step explanation:

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