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  1. P

    C < a + b

    Do you know any good example (or proof) that shows that the sum of two sides is alwasys bigger than the third side in a spherical triangle.
  2. P

    Finite geometry

    Let L and M be distinct nonparallel lines in an affine plane of order n. What is the total number on L U M? I hope someone knows how to solve this problem.
  3. P

    Spherical triangle

    In a spherical triangle, c< a+b I have to talk about this subject in an oral exam for about ten minutes. I don't know how I should explain it. If you know about a good example too, related to this subject of cource, I would really appreciate it.
  4. P

    A word in english

    Triangle has three angles but what do you call it when it has just two angles like in a sphere.
  5. P

    Rhumb Line

    Homework Statement Two places, A (66°N and 20°W) and B (66°N and 90°A). Find the distance between them if you go along the 66° latitude (rhumb line). Homework Equations The Attempt at a Solution The answer is 4972 km but I don´t know how to calculate this. Please help me.
  6. P

    How to find the surface area of a spherical triangle?

    Hello I have a spherical triangle with the radius 1, and I have tried so hard to find the surface area. I know that A=120°, b=90° and c=60°. I could calculate that B=73.89° and C=56.31° and a=115.66°. I think I should use the formula (ABC) = (A + B + C - pi) r2 I always get the...