The angle between two perpendicular lines is 90 degrees. I am not sure whether you are referring to any other angles, and if yes, which ones.
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NO!!! Perpendicular means a line is at right-angles( 90 degrees) to anotyher line. 'Up & 'Down' are the directions of movement in a vertical maNNER.
all the lines on a triangle are equal and the opposite sides are parallel
No. Complementary angles add up to 90 degrees. Supplementary angles add up to 180 degrees.
Interior angles add up to 540 degrees Exterior angles add up to 360 degrees
Two angles that add up to 180 degrees are called supplementary angles.