<Tr> <Th> Triangle </Th> </Tr> <Tr> <Td> <Ul> <Li> Altitude </Li> <Li> Hypotenuse </Li> <Li> Pythagorean theorem </Li> </Ul> </Td> </Tr> <Ul> <Li> Altitude </Li> <Li> Hypotenuse </Li> <Li> Pythagorean theorem </Li> </Ul> <Tr> <Th> Parallelogram </Th> </Tr>

Who studied how points lines angles and planes relate to one another