Chennas Narayanan Namboodiripad

{{Short description|15th century Indian mathematician}}

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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.