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 angle, Equilateral triangle - a triangle with 3 equal sides, Isosceles Triangle - a triangle with 2 equal sides, Scalene triangle - a triangle with no equal sides,

Geometry Vocabulary

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