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Topic 11 Part 2

Two Dimensional Shapes and Their Attributes Lessons 3-9

polygon A closed figure made up of line segments
side A line segment that forms part of a polygon
vertex of a polygon The point where two sides of a polygon meet.
diagonal A line segment that connects two vertices of a polygon that are not next to each other.
triangle A polygon with three sides.
quadrilateral A polygon with four sides.
pentagon A polygon with five sides.
hexagon A polygon with six sides.
octagon A polygon with eight sides.
decagon A polygon with ten sides.
equilateral triangle A triangle having three sides of the same length.
isosceles triangle A triangle with at least two sides having the same length
scalene triangle A triangle in which no sides have the same length.
right triangle A triangle in which one angle is a right angle.
acute triangle A triangle in which all three angles are acute angles.
obtuse triangle A triangle in which one angle is an obtuse angle.
trapezoid A quadrilateral with exactly one pair of parallel sides.
parallelogram A quadrilateral with two pairs of parallel sides.
rectangle A special parallelogram with four right angles.
rhombus A special parallelogram in which all sides are teh same length.
square A special parallelogram with four right angles and all sides the same length.
Created by: Third Graders