An irregular pentagon may have one right (90o) angle.
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A pentagon can have:none (regular or irregular pentagon)one, two or three right angles (irregular pentagon).
Yes if it's an irregular pentagon
None in a regular pentagon but it's quite possible to have right angles in an irregular pentagon.
A pentagon with 3 right angles is considered to be an irregular pentagon because not all angles and all sides are equal.
a pentagon has 5 angles. In a regular pentagon, there are no right angles. Each angle is 72 degrees. In a irregular pentagon, there may be right angles...not sure how many..depends on how you draw it