The lengths of the sides of a triangle are 17, 8, and n. which of the following must be true?
a. 9 < n < 25 b. n > or equal to 25 c. n < 9 d. 9 < or equal to n < or equal to 25 at first i thought it was b, then i thought it was a or is it a? ?

Two lines parallel to the same plane are parallel to eachother

Given: lines a and b are parallel and line c is a transversal. prove: 2 is supplementary to 8 what is the missing reason in the proof? statement reason 1. a || b, is a transv 1. given 2. ∠6 ≅ ∠2 2. ? 3. m∠6 = m∠2 3. def. of congruent 4. ∠6 is supp. to ∠8 4. def. of linear pair 5. ∠2 is supp. to ∠8 5. congruent supplements theorem corresponding angles theorem alternate interior angles theorem vertical angles theorem alternate exterior angles theorem

Non-euclidean geometry was discovered when, in seeking cleaner alternatives to the fifth postulate, it was found that the negation could also be true a. true b.false