In a right triangle the greatest angle is 90 degrees.
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Sure. The other two angles would then be 20 each.
The sum of the angles is 180 degrees in any triangle. So 180-140 is 40 and the third angle is 40 degrees.
A = 60 B = 20 C = 140 This can have a large number of answers.
Providing that it is a regular nonagon then each exterior angle measures 40 degrees and each interior angle measures 140 degrees
140