The Properties of a Trapezoid
Definitions and formulas for the perimeter of a trapezoid, the area of a trapezoid, properties of the sides and angles of a trapezoid, properties of the sides and angles of an isosceles trapezoid
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| perimeter of a trapezoid | area of a trapezoid | sides and angles of a trapezoid |
| properties of the isosceles trapezoid |
| The perimeter of a trapezoid: | |
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To find the perimeter of a trapezoid, just add up all the lengths of the sides: Perimeter = a + b + c + B |
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| The area of a trapezoid: | |
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To find the area of a trapezoid... The longer base (the bottom) is big B and the smaller base (the top) is little b...
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| Yeah, that's the formula... But let's check out where it comes from! | |
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Take two copies of the trapezoid (one blue trapezoid and one green trapezoid)... Tip one upside down and stick them together... Now, you've got a parallelogram. Area of a parallelogram = base x height But, this is double of what we need... So, multiply by 1/2!
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