The measures of these four angles add up to 360 degrees. (Remember the circle.)
a + b + c + d = 360°It doesn’t matter how many lines you intersect through a single point. The total measure of all the angles
formed will still be 360 degrees.
a + b + c + d + e + f + g + h = 360°
a = e, b = f, c = g, d = h- If two lines are perpendicular to each other, each of the four angles formed is 90 degrees.
A 90-degree angle is called a right angle.
Perpendicular: