These are all acute angles. Any angle less than 90 degrees is an acute angle, and any angle greater than 90 degrees is an obtuse angle. 90 degree angles are called right angles. 180 degrees is considered a straight line, and 360 degrees is considered a circle.
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65 degrees is an acute angle
45 degree angle
Yes because angles on a straight line add up to 180 degrees
The complementary angle of 65 degrees is 25 degrees and together they form a right angle of 90 degrees.
Use a straight edge and a protractor to construct an acute angle of 65 degrees