Quiz (1 point)

• if AB ⊥ BC, then m∠ABC = 90
• if (WX || YZ) and (m∠WSX = 180) and (m∠YTZ = 180), then m∠WST = m∠STZ

• if the following are true:

  • a = b
  • a = c

  then b = c

• if m∠ABC = 180, then ∠ABX and ∠XBC are supplementary
• if ∠ABC and ∠DEF are supplementary, then (m∠ABC) + (m∠DEF) = 180

• if the following are true:

  • a + b = c
  • b = d

  then a + d = c

• if a + b = c, then a = c + (b ⋅ (-1))

• if y = 180 + (90 ⋅ (-1)), then y = 90

• if m∠ABC = 90, then ∠ABC is a right angle
• if ∠ABC is a right angle, then AB ⊥ BC

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.