It is 90 degrees, it is half of a straight line which is 180 degrees, it is also called a perpendicular line, all squares and rectangles have them on all 4 corners.
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It's less than a obtuse angle and right angle. A acute angle has degrees between 0 degrees and 89 degrees.
An isosceles triangle is a triangle that has two sides of equal length. A right triangle has an interior angle of 90 degrees. A right isosceles triangle has both characteristics. The 90 degree angle will be the angle formed by the sides of equal length.
Because a right angle is a right angle.
It divides an angle into halves.
Assuming your question is what makes a right-angle, it is an angle of 90o .