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Area and Perimeter EQ: How can you apply what you know about finding the perimeter and area of rectangles to solve real world and mathematical problems? September 24, 2012

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What is AREA and PERIMETER? area – the measurement of the inside of a figure Area = Length x Width Or A = L x W Example: A rectangular soccer field is measured 10ft by 3ft. Can you find the area? perimeter – the measurement of the outside of a figure Perimeter = (2 x L) + (2 x W) Or P = add all sides Example: A rectangular soccer field is measured 10ft by 3ft. Can you find the perimeter? 3ft 10ft 3ft A = 30 ft 2 P = 26ft

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Let’s try another one together! Anthony wants new carpeting for his bedroom. His bedroom is a 5 yd by 11 yd rectangle. How much carpeting does he need to buy to cover his entire bedroom? What is the perimeter of his bedroom? 5 yd 11 yd A = L x W A = 11yd x 5yd A = 55yd 2 P = (2 x L) + (2 x W) P = (2 x 11yd) + (2 x 5yd) P = 22 + 10 P = 32`yd

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In your groups solve… Montia is making a display board for the school elections. The display board is a 7 ft by 9 ft rectangle. She needs to add a ribbon border around the entire display board. What is the length of ribbon that she needs? What is the area of her board? draw a picture or use cubes use your formulas P = (2 x L) + (2 x W) P = (2 x 9ft) + (2 x 7ft) P = 18ft + 14ft P = 32ft 9 ft 7 ft A = L x W A = 9ft x 7ft A = 63ft 2 Kiss your brain!

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This is a little harder. Brisa is making a display board for the school talent show. The display board is a 10 ft by 9 ft rectangle. The ribbon costs $2 per foot. How much will it cost to add a ribbon border around the entire display board? FIRST P = (2 x L) + (2 x W) P = (2 x 10ft) + (2 x 9ft) P = 20ft + 18ft P = 38 ft THEN Multiply the cost by the perimeter to find the total cost. Total Cost = $2 x 38ft Total Cost = $76

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Challenge Miguel has a rectangular rose garden that measures 8 m by 10 m. One bag of fertilizer can cover 20 m 2. How many bags of fertilizer will he need to cover the entire garden? A = L x W A = 8m x 10m A = 80 m 2 Number of bags = 80 m 2 ÷ 20 m 2 Number of bags = 4

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Go to Stations ComputersApplicationProblem Solving Ms. Williams Rotation 1 Miguel Justin Evelin Angel Brisa Leanna Montia Jair Leslie Hichief Asli Emanuel Ashley Zy’Reayanna Antony Rotation 2 Emanuel Ashley Zy’Reayanna Antony Miguel Justin Evelin Angel Brisa Leanna Montia Jair Leslie Hichief Asli Rotation 3 Leslie Hichief Asli Emanuel Ashley Zy’Reayanna Antony Miguel Justin Evelin Angel Brisa Leanna Montia Jair Rotation 4 Brisa Leanna Montia Jair Leslie Hichief Asli Emanuel Ashley Zy’Reayanna Antony Miguel Justin Evelin Angel

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What is the perimeter of this irregular shape?

What is the perimeter of this irregular shape?

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