Question

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Answer 1

Solution-

Extending AC we get 2 triangles, i.e ΔABC and ΔADC.

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Answer 2

Step-by-step explanation:

A + B + C + D = 360 (angle sum property). ...... 1

D + ADC = 360 (complete angle) ..... 2

From 1 and 2,

A+B+C+D = D+ADC

Therefore, A+B+C = ADC

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