Quiz (1 point)

• m∠ABC = m∠CBA
• if (m∠ABC = m∠CDA) and (m∠BCD = m∠DAB), then quadrilateral ABCD is convex
• if quadrilateral WXYZ is convex, then (((m∠WXY) + (m∠XYZ)) + (m∠YZW)) + (m∠ZWX) = 360

• if the following are true:

  • a + b = c
  • d = b

  then a + d = c

• if a = b, then c + b = c + a

• if a = b, then a + c = b + c

• if the following are true:

  • a = b
  • a = c

  then b = c

• if ((a + b) + a) + b = 360, then a + b = 180

• if x + (m∠ABC) = y, then x + (m∠CBA) = y
• if (m∠ABC) + (m∠DEF) = 180, then ∠ABC and ∠DEF are supplementary
• if ∠WST and ∠YTS are supplementary, then WS || YT

• if the following are true:

  • a + b = c
  • b = d

  then a + d = c

• if a + b = c, then b + a = c

• if the following are true:

  • a + b = c
  • b = d

  then a + d = c

• if (m∠ABC) + (m∠DEF) = 180, then ∠ABC and ∠DEF are supplementary
• if ∠WST and ∠YTS are supplementary, then WS || YT
• if AB || CD, then BA || DC
• if (AB || CD) and (AC || BD), then ABDC is a parallelogram

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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