different angles based on their properties or characteristics.
An angle that measures 90 degrees is called a right angle. Right angles don’t have to face the right—any angle that measures 90 degrees is a right angle. A right angle is marked with a square at the vertex. Right angles are very common—they form the corners of squares and rectangles, doors and windows, and much, much more!
Which of these angles is a right angle?
ABCD