Match the parametric equations with the verbal descriptions of the surfaces by putting the letter of the verbal description to the left of the letter of the parametric equation. 1.r(u, v) = ui + cos vj + sin vk 2. r(u, v) = u cos vi + u sin vj + u^2k 3. r(u, v) = ui + vj + (2u - 3v)k 4. r(u, v) = ui + u cos vj + u sin vk a. circular paraboloid b. cone c. plane d. circular cylinder

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