Study Guide for Shapes and Designs Unit Test

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Extra Help Worksheets and Site.

Link to Geometry and Regular Polygon Site

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Investigation 2.1 Notes

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
ORA = 180 - 360/n   
when n = any number of sides of a polygon

Investigation 1.5 - Drawing with a Ruler and Protractor

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

Notes from class- click here to access
These notes cover the Investigation Questions A and B from class.