Question

give an excellent explanation so that I can understand that how to find the exterior angle property of a triangle please​

Answer 1

Answer:

See the triangle in the above figure

1. Now, look at angle 1 and angle 2.
2. We know that sum of angles on a straight line is 180.
3. Therefore, 1+2=180°
4. Since the example I have taken is an equilateral triangle, all the angles will be = 60°
5. Therefore, 1+2=180° hence 2=120°
6. 3+4=120° as 60+60=60°
7. Hence 2=3+4
8. This is the explanation for exterior angle property of a triangle