How do intersecting lines compare in euclidean and spherical geometries

Hi, can anyone show me how to do this problem? 100 points for this. in advance

40 points. given: two congruent angles ∠c and ∠r are supplementary. prove: ∠r and ∠c are both right angles. it doesn't have to be exactly 10 rows.statements reasons1. 1. 2. 2. 3. 3. 4. 4. 5. 5. 6. 6. 7. 7. 8. 8. 9. 9. 10. 10.

What is the maximum of the sinusoidal function