Cloverdale River Park a great spot for wildlife viewing, and information about the park's riparian habitat is located along the trail. There are group picnic areas with barbecues and a large parking lot. Both include several wheelchair-accessible spaces. No lifeguard service is available.
Sum of interior angles of an n sided polygon = (2n - 4) * 90 degrees. Let us find the sum of the interior angles of a heptagon. Heptagon is a polygon with 7 sides. Sum of interior angles of a heptagon = (2 * 7 - 4) * 90 degrees. = 900 degrees. If heptagon is regular, then the value of an interior angle is $\frac{900}{7}$ degrees = 128.57 degrees.
It is obvious from the figure that the sum of the measures of the interior angles of the octagon is equal to the sum of the interior angles of 6 triangles. As we know that sum of the interior angles of a triangle is #180^@#, the sum of 8 interior angles of octagon will be #6xx180^@=1080^@# Extension. Comparing with this situation we can say that a polygon of n-sides can be divided into #n-2# triangles and thereby the sum of the interior angles of polygon of n-sides will be #=(n-2)xx180 ...