They are always identical angles unless the bottom and top lines are not parallel!!!!
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When two parallel lines are intersected by a transverse line, they form eight angles. You can consider the parallel lines as the horizontal lines of the letter Z and the transversal as the sloped line of Z. Then the two angles in that Z-shape are the Z angles. The transversal for Z-angles can slope either way. It can be proved that Z-angles, properly called ALTERNATE angles, are equal.
z: alternate interior angles c: consecutive interior angles f: corresponding angles x: vertically opposite angles
F for corresponding angles and Z for alternate angles
yes, except for the special case rhombus which is a square. A square has 4 right angles.
A special type of Kite has exactly two right angles and a certain type of trapezium can have 2 right angles.