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The angle at which a alphabet looks exactly the same during the rotation is called angle of rotation. Example- The alphabet I it rotates and the alphabet looks exactly the same after it rotates 2 times , so, the angle of rotation of the alphabet I is 2 , H-2 , K-4, M-4, etc.
It depends on the angle not all obtuse angles measure the same. To measure an angle you use a protractor.
yes in fact every triangle has at least one acute angle
because every two lines form an angle
No.