Question

Prove that, the Sum of all the three angles of a
triangles is 180​

Answer 1

Answer:

the sum of 60*3=180 so hence it is proved

Answer 2

Step-by-step explanation:

ANSWER

Given :

A triangle ABC.

To prove :

∠A+∠B+∠C=180 ⁰

⟹∠1+∠2+∠3=180 ⁰

Construction :

Through A, draw a line l parallel to BC.

Proof :

Since 1 ∥BC. Therefore,

∠2=∠4 .......eq(i)

And, ∠3=∠5......eq(ii)

adding eq(i)and(ii)

Therefore, ∠2+∠3=∠4+∠5

∠1+∠2+∠3=∠1+∠4+∠5 [adding∠1bothSide]

∠1+∠2+∠3=180 ⁰

Thus, the sum of three angles of a triangle is 180⁰.

Hope it helps you mate

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