11.1 notes
TRANSCRIPT
11.1 Area of Parallelograms & Triangles
HW pg. 723 #426 evens
March 26, 2015
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:
6m12m
20m
Area of a Parallelogram: A = bhThe altitude will be perpendicular to the base.
A = _____Find the area of the parallelogram:
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:
Find the height of the parallelogram.
x
20 m
Area = 100 m2
Find the area of the rectangle.
18 m
y
Perimeter = 50 m