Question

prove that angle 1 + angle 2 + angle 3 + angle 4 + angle 5=360°

Answer 1

Now, separate the star so only the triangle with angles c and e are visible- and draw the line l again. ... Is the sum of two adjacent angles is 180 degrees, how do you prove this? ... How do I prove that the sum of exterior angles of any quadrilateral is 360 degree?