1.6 – Two- Dimensional Figures. Polygons A polygon is a closed figure formed by sides. The vertex...
-
Upload
doreen-norris -
Category
Documents
-
view
226 -
download
2
Transcript of 1.6 – Two- Dimensional Figures. Polygons A polygon is a closed figure formed by sides. The vertex...
1.6 – Two-1.6 – Two-Dimensional Dimensional
FiguresFigures
PolygonsPolygons• A polygon is a closed figure formed
by sides.
• The vertex of each angle is a vertex
of the polygon.
• A polygon is named by the letters of
its vertices, written in order of
consecutive vertices.
PolygonsPolygons Not Polygons
Concave Concave PolygonsPolygons
Contains vertices in the interior of the polygon. If you were to draw lines containing each side of the polygon there would be lines crossing through
the interior of the polygon.
Convex PolygonsConvex Polygons
No vertices are in the interior of the polygon.
If you draw lines containing the sides there would be no
points in the interior.
Number of Sides Polygon
3 Triangle
4 Quadrilateral
5 Pentagon
6 Hexagon
7 Heptagon
8 Octagon
9 Nonagon
10 Decagon
11 Hendecagon
12 Dodecagon
N N-gon
An equilateral polygon is a polygon in which all sides are congruent.
An equiangular polygon is a polygon in which all angles are congruent.
A convex polygon that is both equilateral and equiangular is called a regular polygon.
Name each polygon by its number of sides. Then classify it as convex or concave and regular or irregular. A.) B.)
C.) D.)
• The perimeterperimeter of a polygon is the sum of the lengths of the sides of the polygon.
• The circumferencecircumference of a circle is the distance around the circle.
• The areaarea of a figure is the number of square units needed to cover a surface.
b
dc
h
s
s
w
l
d
r
Find the perimeter or circumference and area of each figure.
A.)
3.2 cm
2.1 cm
B.) 3in.
C.)
6 ft.
D.)
9.5 in. 9.5
in.
10.2 in.
8 in.