Investigation 2.1 - Regular Polygons angle and angle sum formulas

The focus question is: What is the size of each angle and the sum of all angles in a regular polygon with n sides?

The students will review what is important in a polygon and how regular and irregular polygons compare.  The goal is for students to develop formulas the sum of interior angles for a polygon of n sides.


S - Sum of all angles
S = 180 (n - 2)  
when n = any number of sides of a polygon


A - measure of one angle
A = 180 (n - 2)/ n
OR  
A = 180 - 360/n   
when n = any number of sides of a polygon

Link to Geometry and Regular Polygon Site

Click here to access

Investigation 1.5 - Drawing Challenge

Focus Question: In a triangle, what measures of side length and angles give enough information to draw a figure?

We completed Investigation 1.5 together in class and the students need to complete B #2-6 for homework.

Notes from class- click here to access

(These notes cover the Investigation Questions A and B from class.)