No, it must be obtuse.
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Obtuse Angle
yes. the supplement adds to the acute angle to make 180 degrees. An acute angle is less than 90 degrees. Example: acute angle is 30 degrees. 180-30 is 150, which is obtuse.
yes complement is 90-angle and supplement 180-angle
Yes because supplementary angles add up to 180 degrees.
1 acute angle = 1 acute angle