It should have been a = -1 and b = 2: I didn't read the diagram correctly.
14 - 1 - 4 = 9 which checks out.
The Z co-ordinate is 2 not -1.
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but b refers to the front-back distance doesn't it? Which is -1! Z=2 is the up down distance, and isn't that represented by C?
No: you are trying to find the y distance.
Z distance is 2, and the X distance is -1: both from the origin.
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