We have learned that the sum of the angles of a triangle is equal to 180 degrees. is that just a random number? why do you think the sum is 180? can you prove it?

For example if you take a right triangle, one angle is already 90 degrees. The other 2 angles measure would be determined by knowing that a triangle’s inside angles add up to 180. So the other 2 angles are 45 degrees each. Also it is not just a random number. It is based on a protractor. Hope this helps!