Therefore the answer is \(120^\circ\). Split the octagon into small triangles. Each angle at the centre is \(360^\circ\) divided by eight which is \(45^\circ\). This means that in each triangle we ...

A hexagon will have four triangles. An octagon will have six triangles. So the sum of the interior angles of a polygon can be found by taking the number of sides, subtracting 2 and then ...