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Acute Triangle

a triangle with 3 acute angles

Obtuse Triangle

a triangle with one obtuse angle

Right Triangle

a triangle with 1 right angle

Equilateral Triangle

a triangle with three equal sides

Isosceles Triangle

a triangle with two congruent sides

Scalene Triangle

a triangle with no congruent sides


a polygon with 4 sides


A quadrilateral with two pairs of parallel sides


a quadrilateral with exactly one pair of parallel sides


a parallelogram with 4 congruent sides


a parallelogram with four right angles


having four equal sides and four right angles or forming a right angle

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