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Finding the Area of Polygons

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Vocabulary Perimeter The sum of all sides of the shape. Area The total occupied space of a shape in units squared.

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Area of Triangles Base (b) Height (h)

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We know how to find the area of a square or a rectangle

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What if we cut the shapes in half?

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Example = = 12 units squared

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Try

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One More

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Notice all of our examples have been right triangles In other triangles, you must make sure you are using the height. Height is always perpendicular to the base

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Find the Area 3 in 7 in 5 in

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Find the Area 6 in 12 in 10 in

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.and these guys make millions

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Finding the Area of Other Polygons

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We Know How to Find the Area of Several Figures Already

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Finding the area of a rhombus and parallelogram They are just squares and rectangles pushed over Area = 4 un Notice that we are not using the length of the angled side! 3

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Trapezoid Formula for area

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Trapezoids

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Area of Other Polygons

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Sometimes Things Are Not Perfect or We are Missing Vital Information Divide the shape into shapes we can use

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Example

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4 4

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2 2 3

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Closure: With a partner find the area 3 5 6 4