Question

For the figure given ,prove that angle ADC=Angle A+Angle B+Angle C​

Answer 1

Answer:

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

From the properties of triangle, the sum of all the 3 angles of a triangle is 180°

So in ΔABC,

And

Again in ΔADC,

Comparing both the equations,

Substituting the values,

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