Question

in a triangle abc proove that the sum of all the angles is 180°​

Answer 1

Answer:

there 3 types of rectangle we learnt.on that basis we may prove that the triangle have three angles

Step-by-step explanation:

in right angles triangle 90+60+30=180

Answer 2

Answer: please mark brainliest

Step-by-step explanation:

In order to prove that the sum of angles of a triangle is 180, you must know the theorems of angles of a triangle.

We know that,  alternate interior angles are of equal magnitude.

This'll help us get the answer. Let us assume a triangle ABC. Now we have to substitute the angles.

∠PAB + ∠BAC + ∠CAQ = 180°. where PQ line parallel to side BC touching vertex A.

∠PAB = ∠ABC & ∠CAQ = ∠ACB BECAUSE alternate interior angles are congruent..

Hence we get, ∠ABC + ∠BAC + ∠ACB = 180°   [Proved]