Please help if been stuck on this problem for forever

Which two undefined geometric terms always describe figures with no beginning or end?

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.

The functions f(x) and g(x) are shown in the graph f(x)=x^2 what is g(x) ?