A line with equal angles from a surface is referred to as being normal
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beam
A line at right angles to another line.
a line that intersects to form four right angles is a perpendicular
To draw a pentagon with 3 right angles, start by drawing a horizontal line segment. From one endpoint of the line segment, draw a vertical line segment perpendicular to the horizontal line to form a right angle. Then, draw two more right angles by drawing two more line segments from the endpoints of the original horizontal line segment. Finally, connect the endpoints of the line segments to form a pentagon with 3 right angles.
A straight angle is a line which has an angle of 180 degrees therefore two right angles (90 degrees) make a line.