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Measure them!
If there were not that difference of 3o, the angles would be 60 and 30. Because of the difference the angles must be 61o and 29o.
You can find the area when you look at the angles and measure it to see if they are all the same size.
When a polygon is regular, each exterior angle is equal to the other exterior angles. Since the sum of all the exterior angles is 360 degrees, if you divide 360 by the measure of one exterior angle, you will get the number of sides. If you instead have the measure of an interior angle, simply calculate (180 - interior angle measure) to find the measure of the exterior angle, and use the above paragraph.
They measure 105 degrees each.