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.
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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
An angle of 65° can not be trisected using a compass and straight edge.
Oh, dude, it's like super easy. First, you draw a straight line. Then you put the pointy end of the compass on one end of the line and swing it around until it hits the line at 65 degrees. Boom, you've got yourself a 65-degree angle. Like, it's not rocket science or anything.
65 degrees is an acute angle