number of sidestype of polygon 3triangle 4quadrilateral 5pentagon 6hexagon 7heptagon
TRANSCRIPT
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Number of sides Type of Polygon
3 Triangle
4 Quadrilateral
5 Pentagon
6 Hexagon
7 Heptagon
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Number of sides Type of Polygon
8 Octagon
9 Nonagon
10 Decagon
12 Dodecagon
n n-gon
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Convex if no line that contains a side of the polygon contains a point in the interior of the polygon.
Concave or non-convex if a line does contain a side of the polygon containing a point on the interior of the polygon.
See how it doesn’t go on theInside-- convex
See how this crossesa point on the inside?Concave.
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Remember: Equiangular & equilateral
Decide whether the following polygons are regular.
Equilateral, but not equiangular, so it is NOT a regular polygon.
Heptagon is equilateral, but not equiangular, so it is NOT a regular polygon.
Pentagon is equilateral and equiangular, so it is a regular polygon.
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Students will analyze and determine angle measures in polygons.
Why? So you can describe a baseball park, as seen in Examples 28 & 29.
Mastery is 80% or better on 5-minute checks and practice problems.
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Page 510-512
#’s 3-31 all
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State whether the figure is a polygon. If it is not, explain why.
Not D – has a side that isn’t a segment – it’s an arc.
Not E– because two of the sides intersect only one other side.
Not F because some of its sides intersect more than two sides/
F
E
D
CBA
Figures A, B, and C are polygons.
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Identify the polygon and state whether it is convex or concave.
A polygon is EQUILATERALIf all of its sides are congruent.A polygon is EQUIANGULARif all of its interior angles are congruent. A polygon is REGULAR if it isequilateral and equiangular.