Acute Angle, an angle that measures LESS than 90 degrees, Acute Triangle, A 3 sided geometric shape in which each angle is less than 90 degrees, Adjacent, right next to each other, Attribute, A characteristic used to describe something, also known as property, Congruent, Having exactly the same shape and size, Equilateral Triangle, A triangle with all the equal sides, Hierarchy, A system for organizing things into groups based on their characteristics or properties, Isosceles Triangle, A triangle with at least two equal sides, Kite, a flat, 4 sided shape can look like a diamond, Obtuse Angle, An angle that measures more than 90 degrees, Obtuse Triangle, A triangle with 2 acute angles (less than 90 degrees and 1 obtuse angle (more than 90 degrees), Parallel Lines, 2 lines that never touch, Parallelogram, A polygon with exactly 4 sides and 2 sets of sides that will never met, Perpendicular Lines, 2 lines that intersect and form 90- degree angles at the intersection, Polygon, A closed shape with at least 3 straight sides, Quadrilateral, A polygon with exactly 4 sides, Rectangle, A 4 sided shape with 4 right angles, Regular Polygon, All sides are the exact same length, and all the angles are the same size, Rhombus, A 4 sided shape with 4 equal sides and opposite angles that are equal, Right Angle, An angle that measures 90 degrees, Right Triangle, a triangle that has 2 acute angles and 1 acute angle that measures 90 degrees, Scalene Triangle, A triangle with no equal sides, Square, A polygon with 4 equal sides and 4 right angles, Trapezoid, A 2 dimensional shape that has four sides with one set of opposite sides being parallel, Two-dimensional figure, Flat, having only length and width, Venn diagram, Overlapping circles that help sort things into groups, Vertex/Vertices, A corner point where two or more lines, edges or sides of a shape meet.

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