16.1 Polygons p.354-355

I. Polygon: Poly- =many, in this case 3 or more; -gon = sides

A. A closed plane figure (2-D) with straight sides that are connected line segments

B. We can use triangles to figure out the amount of total degrees for interior angles – all triangeles= 180 degrees total

C. Decagon: a polygon with ten sides, angles, and vertices

D. n-gon: a polygon with n sides, angles, and vertices

II. Vertex: a point where two sides of a polygon meet

15.3 Activity

Draw a design that includes each of the following items at least one time each:
1.) Point- color black
Kinds of Lines: all lines must be STRAIGHT, COLORED and have AT LEAST TWO POINTS - establishing the direction of the line
2.) Ray- red (using an endpoint and arrow to show that it is a ray)
3.) Line- brown(using arrows on both ends to show that they extend forever)
4.) Line segment- blue
Angles – showing using the name and an arc (or square for complementary)
5.) Vertical angles – yellow
6.) Congruent angles – green – show with arc and dash
7.) Adjacent angles – orange
8.) Complementary angles – purple - indicate with a square in the corner (check with the corner of a piece of paper to make sure it is 90 degree)
9.) Supplementary angles – show with a 180 degree arc
A Key
10.) A key that explains the colors used and the lines used

Measuring angles with a protractor

Amble Side Primary has some good practice resources

Here is a tool from math playground

This site from ixl.com sets up the protractor for you in this practice activity