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Parallelogram
a quadrilateral with TWO PAIRS of parallel sides

Quadrilateral
a polygon with 4 sides, 4 vertices, and 4 angles

Rectangle
a parallelogram with 4 right angles and opposite equal sides

Rhombus
a parallelogram with 4 equal sides and no right angles

Square
a parallelogram with 4 right angles and 4 equal sides

Right Angle
an angle that measures 90 degrees

Acute Angle
an angle that measures less than 90 degrees

Obtuse Angle
an angle that measures more than 90 degrees

Parallel Lines
two lines that will never intersect

Perpendicular Lines
two lines that intersect at a right angle

Trapezoid
a quadrilateral with only ONE PAIR of parallel sides

Vertex/Vertices
the place, or corner, where two sides meet

Polygon
a figure with straight, closed sides

Right Triangle
A triangle with a 90 degree angle

Acute Triangle
A triangle with 3 acute angles

Obtuse Triangle
A triangle with 1 obtuse angles

Equilateral Triangle
A triangle with 3 equal sides

Isosceles Triangle
A triangle with 2 equal sides

Scalene Triangle
A triangle with no equal sides
