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It is the geometry of a sphere as well as of shapes on the surface of the sphere.
Yes, although a triangle (in normal geometry) can only have one right angle, no more. It is possible for a triangle to have all three right angles in spherical geometry (if you were to draw the triangle on a sphere).
It's pretty much geometry on a sphere
Sphere is the term used in geometry.
yes, the ball is a sphere with a diameter and a radius-which is geometry
sphere
Yes... and no.Triangles in Euclidian space, or a Euclidian plane - the kind usually considered in school - always add up to 180 degrees.However, other kinds of geometry have been invented, for example, triangles on a sphere. The "lines" that make up those "triangles" are the major circles - the sides of the triangles are thus the shortest distance between those points (along the surface of the sphere). It is interesting to note that the angle excess - the amount above 180 degrees - of such a triangle is directly proportional to the triangle's area.