"Right angle" is the name we give to one single angle that measures 90 degrees. It's easy to recognize, because it looks like a perfect corner.
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2 right angles
A "right angle" is 90 degrees.
i think it has 1 right angle
A regular heptagon doesn't have right angles, but an irregular heptagon can have 5 right angles.
A right angle is 900, so 2700 make three right angles.