Question

0.1 Prove that sum of the angles of triangle is 180°​

Answer 1

Answer:

Step-by-step explanation:

to prove:sum of angles in triangle:180°

• draw a triangle ABC

• draw a parallel line to line segment BC

we know that alternate angles are equal

1. so, red colored angle = angle ACB
2. blue colored angle=angle ABC

we know that sum of angles on a st. line is 180°

so, blue colored angle+red colored angle+yellow colored angle=180°

but red colored angle = angle ACB

blue colored angle=angle ABC

so, angle ABC+angle ACB+yellow colored angle=180°

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