Acute Angle is an angle that is less than 90°
Right Angle is an angle that is 90° exactly
Obtuse Angle is an angle that is greater than 90° but less than 180°
Straight Angle is an angle that is 180° exactly
Reflex Angle is an angle that is greater than 180°
This is a great tool to illustrate how to classify various angles: http://bit.ly/vIySAB
Introducing and contrasting Convex and Concave Polygons.
Source: MICDS Integrated Mathematics 1 Notes, Geogebra
The table below reviews the list of names for polygons with different numbers of sides
Source: MICDS Integrated Mathematics 1 Notes
Defining and illustrating regular polygons.
Source: MICDS Integrated Mathematics 1 Notes, Geogebra
Can you find the sum of the measures of angles (if you added all the angles together) within a given polygon?
Using the pattern you notice below, determine a rule to find the sum of the measures of the interior angles of an n-gon.
Be sure to consider the number of sides (n) and the number of possible diagonals within the polygon.
Source: MICDS Integrated Mathematics 1 Notes
Source: MICDS Integrated Mathematics 1 Notes, Geogebra
