Perpendicular lines meet at right angles which is 90 degrees
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Actually there are 4 angles formed by 2 intersecting lines, and as long as the lines are PERPENDICULAR, the angles are all right angles, 90 degree each.
If the lines are perpindicular then each pair of vertical angles are supplementary
If the lines almost touch but they don't then there is no angle. There is no name for an angle that does not exist.
It depends on the angle not all obtuse angles measure the same. To measure an angle you use a protractor.
Yes. Perpendicular lines intersect to form a right or 90 degree angle. Not all intersecting lines form a right angle.