perpendicular lines always form a right angle
If you mean 5 by 12 by 13 then they will form a right angle triangle
right angle
Intersecting lines that form a right angle are perpendicular lines.
a quadrilateral where each angle is a right angle
A right angle is an internal angle equal to 90o You can tell if an angle is a right angle because it has a little symbol which is a square where the two lines meet to form the angle. A right angle is a quarter of a circle. Lines that are at a right angle are perpendicular to each other.
Two lines that form a right angle are Perpendicular. This can be show by an upside down T.
When two lines intersect to form a right angle they are called perpendicular.
the lines are perpendicular, which basically means the two lines intersecting form a right angle
The right angle is formed by the intersection of the triangle's "legs".
that would be a right angle.
Roads don't always form an acute angle, they can form a right angle. If you are really picky, you might say that they can never form a perfect right angle, so two of the angles formed must be acute (and the other two obtuse).