The complementary angle of 65 degrees is 25 degrees and together they form a right angle of 90 degrees.
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It's hard to explain without visual representation. But imagine a 90 degree right angle. Okay, it makes an L, now image a 90 degree angle a little more acute (smaller than 90) that in sense is a 65 degree angle.
65 degrees is an acute angle
Use a straight edge and a protractor to construct an acute angle of 65 degrees
An angle of 65° can not be trisected using a compass and straight edge.
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