Find T. Is it 7 or -1

t = 5

Step-by-step explanation:

These 2 angles are supplementary which mean that together, they equal 180:

20t + 5 + 15t = 180

35t + 5 = 180

35t = 180 - 5

35t = 175

t = 175/35

t = 5

< 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⭐

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