Chennas Narayanan Namboodiripad (born 1428) was a 15th-century mathematician and Tantra ritualist from Kerala, India. Narayanan Namboodiripad was considered to be an authority in the fields of Vaasthusaastram (Indian Architecture), Mathematics and Tantram. He authored a book titled Thanthra Samuchayam which is still considered as the authentic reference manual in the field of temple architecture and rituals. Other contributions to mathematics include: A method of arriving at a circle starting with a square, and successively making it a regular octagon, a regular 16-sided, a 32-sided, 64-sided polygons, etc. Co-ordinate system of fixing points in a plane. Converting a square to a regular hexagon having approximately equal area. Finding the width of a regular octagon, given the perimeter. References https://www.namboothiri.com/articles/thanthram.htm See also Indian Mathematics Scientists from Kerala 1428 births Year of death missing Kerala school of astronomy and mathematics 15th-century Indian mathematicians