In a right angle triangle, the line across from the riht angle is called the hypotenuse.
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It is called a right angle.
Diameter, don't confuse it with the radius which is the line that goes from centre to rim.
acute angle, reflex angle, right angle, a line
The measurements are taken at right angle to the survey line called perpendicular or right angled offsets. The measurements which are not made at right angles to the survey line are called oblique offsets or tie line offsets.
acute angle, reflex angle, right angle, a line