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1. $∆ A B C$

A. $110 °$
B. $110 °$
C. $110 °$
D. $110 °$

Answer: Option A

Explanation:

Given, A=40,B=80

We know, 180=A+B+C, C=180-40-80=60

again, a=40, c=60/2=30

180=a+c+d

d=180-40-30=110

CDA=110

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