Isometric is a perspective where given 3 lines that are of equal length in 3 axes their length will appear equal. What this means in simplified terms is that if you have three 1 foot sticks and you place one pointing upwards, one pointing away from you and one pointing directly to your right they will all look the same length from your perspective. Such a perspective would be said to be in a 1:1 ratio because it is as long as it is wide in 2D-pixel format.
Quote from http://www.lupinegames.com/articles/isoeng4u.htm
Therefore this does not necessarily mean that the angles are equal, just the lenths of the perspective lines and the distance of the outers from the perpendicular.
Quod erat demonstrandum
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If someone tried to make me dig my own grave I would say No.
They're going to kill me anyway and I'd love to die the way I lived:
Avoiding Manual Labour.
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