40 degrees is an acute angle because it's greater than 0 but less than 90 degrees
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40 degrees
180 degrees - 100 degrees - 40 degrees = 40 degrees
supplement + angle = 180180 - angle = supplementangle = supplement + 40 = 180 - angle +40 = 220-angle2 x angle = 220angle = 110 degrees
90 - 40 = 50 degrees.
Each exterior angle is: 360/9 = 40 degrees