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Area & Perimeter

Area & Perimeter. By, Jennifer Sagendorf ITRT – Suffolk Public Schools. Perimeter of a Rectangle. To calculate the perimeter of an object or space, you will need to add the length and width, then multiply by 2. ( 2 + 4 ) x 2 = ______ It means the same as: (2 + 4) + (2 + 4) = ________. 2.

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Area & Perimeter

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  1. Area & Perimeter By, Jennifer Sagendorf ITRT – Suffolk Public Schools

  2. Perimeter of a Rectangle To calculate the perimeter of an object or space, you will need to add the length and width, then multiply by 2. ( 2 + 4 ) x 2 = ______ It means the same as: (2 + 4) + (2 + 4) = ________ 2 4

  3. Try to find the perimeter of these rectangles. 1 6 2 2 3 5 4 3

  4. Perimeter of a Square To find the perimeter of a square, multiply the side by 4. 3 x 4 = ___ 3

  5. Find the perimeter of these squares. 25 5 12 16 8

  6. Perimeter of a Triangle To calculate the perimeter of a triangle you will need to add the sides. 3 + 4 + 5 = ______ 5 3 4

  7. Find the perimeter of these triangles. 5 3 5 5 4 3 10 3 8 5 3 6

  8. Tricky Perimeters(Look carefully.) 3 You will need to remember which sides to add and the values for each side. 2 2 2 2

  9. Area of a Rectangle The area of a rectangle is determined by multiplying length x width. 2 x 4 = ______ 2 4

  10. Area of a Square or Rectangle 2 x 4 = 8 2 4

  11. Find the area of these rectangles. 1 6 2 2 3 5 4 3

  12. Area of a Square You find the area of a square by multiplying the side by itself. 3

  13. Find the area of these squares. 25 5 12 16 8

  14. Area of a Triangle Finding the area of a triangle is different. Area of a triangle = ½ (base x height) ***(Base x height) is the same as (length x width).*** 3 4

  15. Area of a Triangle Sometimes it makes it easier to remember if you can imagine it like this: A triangle is half of a rectangle or square. This is because the base (4) x the height (3) would be the same as the length x the width of a rectangle. 3 4

  16. Find the area of these triangles. 3 4 7 8 2 5 3 6

  17. Area Formulas Rectangle A = length * width A = lw Square A = Side2 A = S2 Parallelogram A = Base * Height A = bh

  18. Triangle A = ½ Base* Height A = ½ bh • Rhombus A = ½ Diag.1 * Diag.2 • A = ½ d1d2 • Trapezoid A = ½ height (base 1+base 2) A = ½ h(b1 + b2) • Circle A = r2

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