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Rene Descartes a french mathematician philosopher.
A plane can be tessellated by triangles, various quadrilaterals, 15 types of convex pentagons (latest discovered in 2015) and various hexagons. No convex polynomial with 7 or more sides will tessellate.
The inclined plane has been around forever. It's how the pyramids were built. Also, other primates use them besides humans. This is kind of like asking, "Who invented the wheel." The answer, unfortunately has been lost to time.
Apparently, Decarte (the guy who discovered it) was lazy, and decided to just lay in bed when he woke up. He ended up watching a fly walk around his ceiling. He noticed its movement was in accordance with two axis, the x and y axis. He had a eureka moment, and got out of bed and started writing the Appendix on Geometry, his book about the coordinate plane.
There can be no answer because the assertion is not true. There are 15 types of convex pentagons - the last discovered in 2015 - which will tessellate.