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An oblique angle is any angle not 90 degrees or a multiple of 90 degrees. So 45 degrees is an oblique angle. A 45 degree angle is also an acute angle (anything less than 90 degrees).
30 Degrees
The complementary angle of 72 degrees is 18 degrees
72 degrees each. There are 5 angles. You divide 360 degrees by 5 and get 72 degrees.
Assuming you mean 72 degrees, supplement is 180-72 = 108 degrees