Quiz (1 point)

• if ABCD is a parallelogram, then AB || DC
• if AB || CD, then BA || DC
• if AB || CD, then CD || AB
• if WX || YZ, then ∠WXZ and ∠XZY are supplementary
• if ∠ABC and ∠DEF are supplementary, then (m∠ABC) + (m∠DEF) = 180

• if the following are true:

  • a + b = c
  • d = b

  then a + d = c

• if a + a = 180, then a = 90

• if m∠ABC = 90, then ∠ABC is a right angle
• if (ABCD is a parallelogram) and (∠CDA is a right angle), then ABCD is a rectangle

Please write your proof in the table below. Each row should contain one claim. The last claim is the statement that you are trying to prove.

Step	Claim	Reason (optional)	Error Message (if any)
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