PLEASE HELP WHICH ONES ARE PROPORTIONAL The formula to determine the diameter of a circle, d, is d=2r, where r is the radius. The radius of a circle is proportional to its diameter.

Nadia is baking muffins. Every 6 muffins require 1/3 cup of fruit. The number of muffins is proportional to the cups of fruit.

The volume of a cube is determined by the formula V=s3, where s is the side length. The volume of a cube is proportional to its side length.

Given: in quadrilateral wxyz , and bisect each other at point a. prove: quadrilateral wxyz is a parallelogram. statement reason 1. and bisect each other. given 2. wa = ya xa = za definition of bisection 3. m∠yaz = m∠xaw vertical angles theorem 4. sas criterion for congruence 5. ∠ ywx ≅ ∠wyz corresponding angles of congruent triangles are congruent. 6. || converse of alternate interior angles theorem 7. m∠xay = m∠zaw vertical angles theorem 8. ∆xay ≅ ∆zaw sas criterion for congruence 9. ∠xzw ≅ ∠zxy corresponding angles of congruent triangles are congruent. 10. || converse of alternate interior angles theorem 11. quadrilateral wxyz is a parallelogram. definition of parallelogram what is the missing statement in this proof? what is the missing statement in this proof?