Post on 25-Dec-2015
Math 90Math 90
9.1
Warm-up/QuizWarm-up/Quiz
Without using any notes see how many Without using any notes see how many formulas you can remember:formulas you can remember:
Area of a triangleArea of a triangle
Area of a kiteArea of a kite
Area of a circleArea of a circle
Area of a parallelogramArea of a parallelogram
Area of a trapezoidArea of a trapezoid
PerimeterPerimeterPerimeterPerimeterPerimeter 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. Diagram
2. Formula
3. Substitution
4. Solution
ExamplesExamplesExamplesExamplesCalculate the perimeter of the following RECTANGLE:
6m
4m1. Diagram1. Diagram
2. Formula2. Formula
3. Substitution3. Substitution
4. Solution4. Solution
2 2P l w
2(6) 2(4)
12 8
20m
The perimeter is 20m.
The perimeter is 20m.
Don’t forget your
units!
Examples ContinuedExamples ContinuedExamples ContinuedExamples ContinuedWhat is the perimeter of this RHOMBUS?
3cm1. Diagram1. Diagram
2. Formula2. Formula
3. Substitution3. Substitution
4. Solution4. Solution
4P b
4(3)
12cm
The perimeter is 12cm.
The perimeter is 12cm.
AreaAreaAreaAreaArea is the measure of the number of square units contained within any polygon.
Area is also calculated using a Four Step Method:
1. Diagram2. Formula3. Substitution4. Solution
Hmmm… I wonder what the area is of the wall I’m painting?
ExamplesExamplesExamplesExamplesWhat is the area of the following RECTANGLE?
1. Diagram1. Diagram
2. Formula2. Formula
3. Substitution3. Substitution
4. Solution4. Solution
3m
12mA lw
2
(3)(12)
36m
The area is 36m2.The area is 36m2.
Try these:Try these:Try these:Try these:
1. Diagram1. Diagram
2. Formula2. Formula
3. Substitution3. Substitution
4. Solution4. Solution
5m7m
2
bhA 2A r
6m
(6)(7)
2
2
42
2
21m
The area is 21m2.
The area is 21m2.
The area is .The area is .
QuizQuizNumber your paper Number your paper from 1 -6.from 1 -6.
Place this list at the top Place this list at the top of your paper.of your paper.
State the name of the State the name of the polygon and which polygon and which formula you would use formula you would use to find area.to find area.
1)1) 2) 2)
3)3) 4) 4)
5)5) 6) 6)