11.1 Area of Parallelograms & Triangles HW pg. 723 #426 evens 1 February 29, 2012 11.1 Areas of Triangles & Parallelograms Objectives: 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 = _____ 10.5m 22m Find the area of the rectangle:
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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!