An Acute angle is smaller than 90 degrees but bigger than 90 degrees.
Obtuse angle is a angle between 90-180 degrees.
A Straight angle is an angle between 180 degrees.
A Right angle is an angle of 90 degrees.
A Quadrilateral is a 4 sided object.
A square is a shape with 4 equal sides and 4 right angles.
A shape with 4 sides and 4 right angles.
A parallelogram with equal acute angles.
A four-sided shape with one pair of parallel sides.