###
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

###
Quadrilateral

a polygon with 4 sides

###
Parallelogram

A quadrilateral with two pairs of parallel sides

###
Trapezoid

a quadrilateral with exactly one pair of parallel sides

###
Rhombus

a parallelogram with 4 congruent sides

###
Rectangle

a parallelogram with four right angles

###
Square

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

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