Area of Trapezoids

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Area of Trapezoids
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A trapezoid can be thought of as half of a
parallelogram also.
Notice that when we put the 2 trapezoids together
we get a parallelogram. We use the bottom of one
trapezoid and the top of the other to make the
base of the parallelogram. Notice that we still
need to use the height of the parallelogram as
well.
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Base 1
height
height
Base 1
Base 2
Base 2
Base 2
Base 1
height
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10 m
A (h)(b1 b2) 2
A (25)(10 22) 2
25 m
A (25)(32) 2
A (800) 2
A 400 m²
22 m
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AREA OF A TRAPEZOID AREA OF A TRAPEZOID AREA OF A TRAPEZOID
Words Numbers Formula

Trapezoid The area of a trapezoid is one-half
the height h times the sum of the base lengths
b1 and b2.
A (h)(b1 b2) 2
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Use the figure to find the following measurements.
1. The perimeter of the triangle
36 cm
2. The perimeter of the trapezoid
44 cm
64 cm
3. The perimeter of the combined figure
4. The area of the triangle
54 cm2
104 cm2
5. The area of the trapezoid
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Use the figure to find the following measurements.
1. The perimeter of the
2. The perimeter of the
3. The perimeter of the
4. The area of the
5. The area of the