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

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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

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Try to find the perimeter of these rectangles. 1 2 2 3 3 45 6

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

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

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

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

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

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

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

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Find the area of these rectangles. 1 2 2 3 3 45 6

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

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

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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

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Area of a Triangle Sometimes it makes it easier to remember if you can imagine it like this: 3 4 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.

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

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Try to find the area and perimeter on these game websites. Funbrain Area & Perimeter Funbrain Area & Perimeter Funbrain Area & Perimeter Funbrain Area & Perimeter Fence Me In! Fence Me In! Fence Me In! Fence Me In! Math Playground: Geometry Math Playground: Geometry Math Playground: Geometry Math Playground: Geometry

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