An angle less than a right angle is considered an acute angle. Acute angles are defined as angles that measure greater than 0 degrees and less than 90 degrees. Therefore, there are an infinite number of angles that are less than a right angle, as any angle between 0 and 90 degrees (exclusive) would fall into this category.
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2 right angles
A "right angle" is 90 degrees.
There aren't any acute angles in a square because an acute angle is less than 90 degrees. however, there are 4 right angles in a square. (which by the way a right angle is a measure of exactly 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.