Quiz (1 point)

• if ray BD bisects ∠ABC, then m∠ABD = m∠DBC
• if ray BX bisects ∠ABC, then point X lies in interior of ∠ABC
• if point X lies in interior of ∠ABC, then (m∠ABX) + (m∠XBC) = m∠ABC
• if distance AX = distance BX, then m∠BAX = m∠ABX
• if m∠XYZ = 180, then (m∠WXY) + (m∠XWY) = m∠WYZ

• if the following are true:

  • a + b = c
  • a = d

  then d + b = c

• if a + a = b, then a = b ⋅ (1 / 2)

• if the following are true:

  • a + b = c
  • d = b

  then a + d = c

• if a + a = b, then a = b ⋅ (1 / 2)

• if the following are true:

  • a = c
  • b = c

  then a = b

• if m∠WST = m∠STZ, then WS || TZ

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.