Obtuse, acute, straight, and right angle.
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A square is a plane rectangle with four equal sides and four right angles, a four-sided regular polygon, and a rhombus having four right angles.
No. A hexagon has 6 sides and 6 vertices (angles). A polygon with four sides and four angles is a quadrilateral.
a rhombus, a quadrilateral without right angle, a quadrilateral with equal opposite parallel sides but no right angles
four equal angles
no triangle do not have four congruent angles