11.1 notes
-
Upload
mrs-hedricks-class -
Category
Education
-
view
251 -
download
1
Transcript of 11.1 notes
11.1 Area of Parallelograms & Triangles
HW pg. 723 #426 evens 1
February 29, 2012
11.1 Areas of Triangles & ParallelogramsObjectives: 1. To develop the concept of area.2. Apply area formulas to solve problems.
Formula for:Area of a Rectangle: A = bh
The base and height are always perpendicular to each other.
What is area?
Rules for Using Formulas:1. Always state the formula you are using first!2. Identify the knowns & unknowns for each variable in the formula.3. Plug the knowns into the equation.4. Solve for the unknown using algebra.5. Be sure to include a label with your answer.
A = _____
10.5m22m
Find the area of the rectangle:
11.1 Area of Parallelograms & Triangles
HW pg. 723 #426 evens 2
February 29, 2012
6m12m
20m
Area of a Parallelogram: A = bhThe altitude will be perpendicular to the base.
A = _____Find the area of the parallelogram:
11.1 Area of Parallelograms & Triangles
HW pg. 723 #426 evens 3
February 29, 2012
Area of a Triangle = 1/2bh
h
b
Find perimeter and area of the triangle.
817
10
21
P = 48 unitsA = 84 units2
Base & height are always perpendicular to each other!
Triangles can have multiple appearances:
11.1 Area of Parallelograms & Triangles
HW pg. 723 #426 evens 4
February 29, 2012
Find the height of the parallelogram.
x
20 m
Area = 100 m2
Find the area of the rectangle.
18 m
y
Perimeter = 50 m
11.1 Area of Parallelograms & Triangles
HW pg. 723 #426 evens 5
February 29, 2012
Find the area and perimeter of the shaded region.
18m
15m
10m
9m 8cm
6cm
3cm
1cm
5cm
11cm
P = 66 mA = 222 m2
P = 38 cmA = 77 cm2
11.1 Area of Parallelograms & Triangles
HW pg. 723 #426 evens 6
February 29, 2012
HW:
11.1 pg. 723 #4-26 evens