if a ⋅ 2 = 180, then a = 90

Start from the conclusion and work back up the proof. Click the arrow to show the parents.

• a = 90,

  if the following are true:

  • a = b
  • b = c

  then a = c

  • 180 / 2 = 90, 180 / 2 = 90
  • a = 180 / 2,

    if the following are true:

    • a ⋅ b = c
    • not (b = 0)

    then a = c / b

    • not (2 = 0), not (2 = 0)
    • a ⋅ 2 = 180