1. Math 90 9.1

2. Warm-up/Quiz Without using any notes see how many formulas you can remember: Area of a triangle Area of a kite Area of a circle Area of a parallelogram Area of a trapezoid

3. PerimeterPerimeter Perimeter is the measure of the distance around a polygon. Definition: a closed figure that consists of line segments (eg. triangles and quadrilaterals are polygons). Perimeter is calculated using a Four Step Method: 1. 1. Diagram 2. 2. Formula 3. 3. Substitution 4. 4. Solution

4. ExamplesExamples Calculate the perimeter of the following RECTANGLE: 1. Diagram 2. Formula 3. Substitution 4. Solution The perimeter is 20m. Don ’ t forget your units!

5. Examples Continued What is the perimeter of this RHOMBUS? 1. Diagram 2. Formula 3. Substitution 4. Solution The perimeter is 12cm.

6. AreaArea Area is the measure of the number of square units contained within any polygon. Area is also calculated using a Four Step Method: 1. 1. Diagram 2. 2. Formula 3. 3. Substitution 4. 4. Solution Hmmm… I wonder what the area is of the wall I ’ m painting?

7. ExamplesExamples What is the area of the following RECTANGLE? 1. Diagram 2. Formula 3. Substitution 4. Solution The area is 36m 2.

8. Try these: 1. Diagram 2. Formula 3. Substitution 4. Solution The area is 21m 2. The area is.

9. Quiz Number your paper from 1 -6. Place this list at the top of your paper. State the name of the polygon and which formula you would use to find area.

10. 1)2) 3)4)

11. 5)6)