In rectangle PQRS, the diagonals intersect each other at point T. If PR = 9 and PQ = 7 what is the area of △PTQ? Round to the nearest tenth.

What is the area of triangle abc if a = 8, b = 11, and c = 15?

How to do this , and can some one explain

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