Question

How to prove the above question​

Answer 1

Answer:

exterior angle = sun of interior angles

Step-by-step explanation:

so

x= alpha + beta + gama

Answer 2

Answer:

First draw a line joining BD,

Then, alpha + beta/2 = x/2 [ Exterior angle property] --> ( i )

Similarly, gamma + beta/2 = x/2 [ Exterior angle property ] --> ( ii )

Adding ( i ) and ( ii ),

Alpha + Beta/2 + gamma + beta/2 = x/2 + x/2

=> Alpha + Beta + Gamma = x

Hence, Proved.