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Notes – Lesson 3.5
Geometry
Name _____________________________________
Definition of Polygon
A polygon is a closed plane figure with at least ________ sides that are segments. The sides intersect only at their
_____________________, and no adjacent sides are ______________________.
Draw:
Convex Polygon
Concave Polygon
Names of polygons – the number represents the number of sides.
3 _______________
4 _______________
5_______________
6 _______________
7 _______________
8 _______________
9 _______________
10 _______________
12 _______________
n ______________ _
Polygon Angle Sums
Name of Polygon
Number of Sides
Number of Triangles
Sum of Angles
Triangle
(
)(180) = 180
Quadrilateral
(
)(180) =
Hexagon
(
)(180) =
Octagon
(
)(180) =
Polygon Angle-Sum Theorem:
Find the sum of the measures of the angles.
heptagon
Find the missing angle measure.
15-gon