By; Tyler and Mackayla
An acute angle is less than 90 degrees.
An obtuse angle is more than 90 degrees and less than 180 degrees.
A right angle is 90 degrees.
A straight angle is exactly 180 degrees.
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A flat shape with four straight sides.
Has four equal sides with four right angles.
Has four right angles.
Has four equal sides with two obtuse angles and two acute angles.
Is a four sided irregular polygon.
Has opposite sides with equal lengths.