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it measures 360 degrees
Ninety Degrees
There are 360 degrees in a full circle. Therefore, there are 360 individual 1 degree angles in a full circle. Each of these angles measures 1 degree, and when you add them all up, they form a complete circle.
A nonagon has 9 sides. It can have one or more 90 degree angles. If it is a regular nonagon then it has 180*7/9 for the interior angle measures which is 140 degrees.
A 'right angle' looks like a corner, and measures 90 degrees.