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2/19/2008 Planner: Area & Perimeter Formulas

2/19/2008 Planner: Area & Perimeter Formulas. Warm Up Planner: Formulas for Area and Perimeter Ms. Taulton would like new carpet in her office. Her office is 20’ long and 12’ wide. What is the area of her office in square feet? What is the perimeter of her office in square feet?

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2/19/2008 Planner: Area & Perimeter Formulas

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  1. 2/19/2008Planner: Area & Perimeter Formulas Warm Up Planner: Formulas for Area and Perimeter Ms. Taulton would like new carpet in her office. Her office is 20’ long and 12’ wide. • What is the area of her office in square feet? • What is the perimeter of her office in square feet? • What is the area of her office in square inches? • What is the area of her office in square inches?

  2. Covering & Surrounding Investigation 1.3 • Objective: Develop formulas for the area and perimeter of a rectangle. Launch Let’s read through Problem 1.3 on page 8. Vocabulary: Dimensions of a rectangle = length & width Looking at Lab Sheet 1.3. Tell me the dimensions or the length and width of a rectangle you can make with 18 floor tiles.

  3. Explore • Let’s read on about decoding designs. • In your groups, complete A-D. • Be prepared to share.

  4. Summarize • What were your strategies for finding area? • What were your strategies for finding perimeter? Area of a Rectangle:Area = length X Width A = lw Area of a Rectangle: Perimeter = 2 X Lengths + 2 X Widths P = 2l + 2w

  5. Covering and Surrounding 4.1 • Launch: • Where the base and the height on a triangle? • What can measures of the base and height tell you? • With triangles you can label different bases and heights on one triangle. How can I change the position of the parallelograms in the Getting Ready and label a different base and height for each one?

  6. EXPLORE • Let’s read Questions A and B of Problem 4.1. • Record your findings and be prepared to share your strategies.

  7. Summarize • How did you find these perimeter measurements? • How could I write this method for finding perimeter of a parallelogram as a rule with symbols? • How did you find the area measurements for the parallelograms? • Can two parallelograms have the same area, but different perimeters? Notes: Area of parallelogram = base x height = b x h

  8. A.C.E. C&S 1.3 • p. 12 16-21, 22, 32 C&S 4.1 p. 60 1-8

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