Geometry help...?

Question

Question 1:
1: In elliptic or spherical geometry a _____ is a great circle.

Question 2:
2: Hyperbolic geometry is base on the Gauss, Lobachevski, and Bolyai Parallel Postulate which states that, through a point not on a line, there exists a _____ number of lines parallel to the given line.

Question 3:
3: In Euclidean geometry, there can be _____ right angle(s) in a triangle.

Question 4:
4: Euclid's Parallel Postulate states that through a point not on a line there exists _____ line parallel to a given line.


Question 5:
5: In hyperbolic geometry, the standard coordinate plane is replaced by a _____.

Question 6:
6: In elliptic or spherical geometry, the sum of the measure of the angles in a triangle is _____ 180 degrees.

Answer 1

1.

Answer 2

6) <180°
♣ the rest are easy and boring.