There are 4 definitions and they are:-
Acute angle which is greater than 0 but less than 90 degrees
Right angle which is 90 degrees
Obtuse angle which is greater than 90 but less than 180 degrees
Reflex angle which is greater than 180 but less than 360 degrees
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In a right triangle, the cosine of an angle is defined as the ratio of the adjacent side of that angle to the hypotenuse.
The angle of friction is defined as the angle of a plane where a body placed on the plane will start to slide.
No. A right angle is defined to be 90 degrees.
Yes a right angle is defined as an angle that measures exactly 900
The bisector of that angle.