if ((a + a) + a) + a = 360, 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
- a = 360 / 4,
if a ⋅ b = c, then a = c / b
- a ⋅ 4 = 360,
if the following are true:
- a = b
- a = c
then b = c
- ((a + a) + a) + a = a ⋅ 4, ((a + a) + a) + a = a ⋅ 4
- ((a + a) + a) + a = 360
- a ⋅ 4 = 360,
- 360 / 4 = 90, 360 / 4 = 90