Question

Prove that the sum of three angles of a triangle is 180°​

Answer 1

Answer:

So, the angle sum ∠A + ∠B + ∠C is equal to the angle sum ∠A' + ∠B' + ∠C'. The three angles A', B', and C' form together a straight angle (they are along the line l). So, their angle sum is 180°.

Step-by-step explanation:

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Answer 2

just add them

Step-by-step explanation:

measure their angle write a+b+c=180

write the values

just add them and write LHS = RHS, hence proved

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