8) the circumference of a circle increases as the diameter increases, where π is the constant of proportionality. which of these is the constant of proportionality for the length of an arc on a circle for a particular value of θ (in radians)? a) θ/2 b) θ c) π/2 d) π

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