Consider the pentagon below:
What is the interior angle sum of a pentagon?
Find an expression for the interior angle sum of the pentagon involving the exterior angles $v$v, $w$w, $x$x, $y$y and $z$z
Hence solve for the sum of the exterior angles of the pentagon. That is, solve for the value of $v+w+x+y+z$v+w+x+y+z.
Is the sum of exterior angles of any polygon equal to 360°?
Deduce the angle properties of intersecting and parallel lines and the angle properties of polygons and apply these properties