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Friday, Feb. 22, 2013 Agenda: TISK & No MM HW Check Lesson 10-1: Polygons Homework: 10-1 problems in packet A B C 35 21

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HW Check 1) 0.4226 2) 0.9848 3) 0.5000 4) 0.3584 5) 0.9744 6) 0.4848 7) 4.0108 8) 0.5000 9) 2.4751 10) 0.5317

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§10.1 Polygons Definitions: Polygon A plane figure that… Is formed by 3 or more segments called sides and… ..each side intersects exactly 2 other sides, one at each endpoint. PolygonNot a Polygon

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Definitions… Convex No line that contains a side of the polygon also contains a point in the interior of the polygon. Concave Not convex (also called nonconvex) Has a “cave in” §10.1 Polygons

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Equilateral All sides are congruent Equiangular All angles are congruent Regular Both equilateral AND equiangular §10.1 Polygons

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Diagonal A segment that joins two nonconsecutive vertices. §10.1 Polygons

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Names of Polygons NameNumber of Sides Triangle3 Quadrilateral4 Pentagon5 Hexagon6 Heptagon7 Octagon8 Nonagon9 Decagon10 Dodecagon12 n-gonn §10.1 Polygons

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Interior Angles §10.1 Polygons

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Exterior Angles §10.1 Polygons

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Practice If each interior angle of a regular n-gon is 108º, how many sides does the polygon have? §10.1 Polygons

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Practice Find the value of x. §10.1 Polygons

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