Draw a Polygon by Inscribe Circle Method

Draw a line AB of length 30 mm.
With centre A and radius AB, draw a semi-circle BM.
With a divider, divide the semi-circle into five equal parts (same as the number of sides). Number the divisions as 1, 2, 3, 4 and 5 starting from M.
Draw a line joining points A and 2.
Draw the perpendicular bisectors of lines A2 and AB intersecting each other at O.
With centre O and radius OA, draw a circle.
With radius AB and starting from B, cut the circle at points, C, D, and E.
Draw lines BC, CD, and DE. Thus, completing the required pentagon.

Engineering Graphics