Discuss the differences between neutral geometry and Euclidean geometry. B. Explain the importance of EuclidÂ’s parallel postulate in the development of hyperbolic and spherical geometry. Note: EuclidÂ’s parallel postulate states the following: Â“For every line l and for every external point P, there exists a unique line through P that is parallel to l.Â” C. The sum of the angles in a triangle varies according to the geometry in which the triangle lies. 1. Prove that the statement Â“There exists a triangle with a sum of angles greater than 180 degreesÂ” is true in spherical geometry. 2. Prove that the statement Â“The sum of the angles in any triangle is 180 degreesÂ” is true in Euclidean geometry. Note: The attached Â“Parallel Postulate to Triangles DiagramÂ” may prove useful in relating the parallel postulate to triangles. 3. Prove that the statement, Â“Rectangles do not exist,Â” is true in hyperbolic geometry.