Although the heliocentric model of the solar system was originally proposed by

The appropriate response is Nicolaus Copernicus. The heliocentric model says that the sun is at the focal point of the universe, and the absence of the move of stars intended to them that they were moving around a similar thing the Earth was, or the Sun.

Each side has to be less then the sum of the other two sides.a, b, c, and e work.

Cause of he different elevations  hope this ?