It has to be 90 degrees and yes, straight.
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a right angle is half of a straight angle
A straight angle is an angle that is 180 degrees exactly (a straight line). A right angle is 90 degrees (like the corners of a square.)
A right angle because 180* - 90* is 90* which is a right angle !
A straight angle.
A right angle has 90 degrees. A right angle is an angle that bisects the angle formed by the two halves of a straight line.