Inv 2.2 - Angle Sum of Any Polygon

Focus Questions: What is the angle sum of any polygon with n sides? How do you know that your formula is correct?

Students went over different methods of finding angle sums of any polygon from ripping corners to dividing shapes into triangles.

Here are some pictures of today's activity.

Helpful site:

Math is Fun - Polygon angles

Inv 1.4 and 1.5

Investigation 1.4

Focus Questions: When a drawing shows two rays with a common endpoint how many rotation angles are there? How would you estimate the measure of each angle? How do you measure and angle with an angle ruler and a protractor?

Important vocabulary:

• supplementary angle - angles that add up to 180˚
• complementary angle- angles that add up to 90˚

Here are the notes from today's class and the 1.3 and 1.4 homework.

Click here to access the notes.

Here is a sheet to help with benchmark angles.  This was given as a hard copy to all the students.

Click here to access the worksheet.

Investigation 1.5 

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.)