Each interior angle is 157.5
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If the 58°-angle is one of the base angles, then the vertex angle is 64°.If the 58°-angle is the vertex angle, then the vertex angle is 58°.
The sum of one angle is simply the measure of that angle.
63 degrees because 180 -39 -78 = 63
Interior angle: 144 degrees
If it's a regular 9 sided polygon then each interior angle will measure 140 degrees.