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Definition of a polygon Characteristics of a polygon a two-dimensional (plane) shape with straight lines Classified by the number of sides they have Convex figures Concave figures A polygon whose vertices all point outward A polygon that has at least one vertex that points inward Isosceles triangle A triangle with two congruent (equal) sides Equilateral Triangle A triangle with three congruent (equal) sides Scalene triangle a triangle that has no congruent (equal) sides A right angle triangle A triangle that has one 90° angle A square -Polygon -Quadrilateral - Rectangle where all sides are equal -4 right angles A rectangle -Polygon -Quadrilateral -2 pairs of opposite Parallel equal sides -4 right angles A rhombus Quadrilaterals A polygon with exactly 4 sides -Polygon -Quadrilateral -all sides have equal length A trapezoid -Polygon -Quadrilateral -2 parallel sided only A parallelogram -Polygon -Quadrilateral -Opposite sides are parallel Pentagon -Polygon with exactly five sides Hexagon -Polygon with exactly six sides Octagon -Polygon with exactly eight sides Heptagon -Polygon with exactly seven sides Nonagon -Polygon with exactly nine sides Decagon -Polygon with exactly ten sides Diameter : a line that passes through the A two-dimensional shape made by circle’s center drawing a curve that is always the Radius : a line that joins the circle’s center to the outside of the circle same distance from the center Circle Circumference : the length of the boundary line that forms the circle, the perimeter Formula : diameter X π or 2πr π≈3.14 Area of circle : πr2 Construct parallel lines Construct perpendicular lines Two lines running in the same direction that will never touch each other Two lines that form a right angle

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