10.3 Polygons, Perimeters, and Tessalatiolns.  Polygon- -Any closed shape in the plane formed by three or more line segments that intersect only at their.

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Presentation transcript:

10.3 Polygons, Perimeters, and Tessalatiolns

 Polygon- -Any closed shape in the plane formed by three or more line segments that intersect only at their endpoints.  Regular Polygon : Has sides which are all the same length and angles of all the same measure.  Perimeter of a Polygon : The sum of the lengths of its sides. Polygons

Regular Polygons NamePicture Triangle 3 sides Quadrilateral 4 sides Pentagon 5 sides NamePicture Hexagon 6 sides Heptagon 7 sides Octagon 8 sides

Types of Quadrilaterals

NameCharacteristicsRepresentation ParallelogramQuadrilateral in which both pairs of opposite sides are parallel and have the same measure. Opposite angles have the same measure RhombusParallelogram with all sides having equal lengths. RectangleParallelogram with four right angles. Because a rectangle is a parallelogram, opposite sides are parallel and have the same measure. SquareA rectangle with all sides having equal length. Each angle measures 90 , and the square is a regular quadrilateral. TrapezoidA quadrilateral with exactly one pair of parallel sides. 5

 Application--Perimeter

 Theorem: The sum of the measures of the angles of a polygon of n sides is (n – 2)180°.  Find: the sum of measures of the angles of an octagon  Solution: sum of n-sided figure = (n – 2)180 sum of 8-sided figure = (8 – 2)180 = 6(180) = 1080° Sum of the Measures of a Polygon’s Angles

Tessellations (Tiling) 8 Tessellation --A pattern consisting of the repeated use of the same geometric figures to completely cover a plane, leaving no gaps and no overlaps.

 Tessellations by Mauritz Escher Tessellations

Angle Requirements of Tessellations Explain why a tessellation cannot be created using only regular pentagons. Solution: Apply ( n − 2)180º to find the measure of each angle of a regular pentagon. Each angle measures 10

Examples of Tessellations 11