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```Area of the trapezoid

a
___________
/|          \
/ |           \
/  |  h         \
/   |             \
-------------------

b

If a and b are the lengths of the two parallel bases of a
trapezoid, and h is its height, the area of the trapezoid is
1/2 ?h ?(a + b) .

Example:

What is the area of a trapezoid having bases 12 and 8 and a
height of 5?
Using the formula for the area of a trapezoid, we see that
the area is

1/2 ?5 ?(12 + 8) = 1/2 ?5 ?20 = 1/2 ?100 = 50.

Perimeter of the trapezoid

The perimeter of a trapezoid is the sum of the lengths of all
its sides.

What is the perimeter of a trapezoid having side-lengths 10 cm,
7 cm, 6 cm, and 7 cm? The perimeter is the sum 10 + 7 + 6 + 7
= 30cm.
```

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 Number Addition Subtraction Multiplication Division Mixed Operation Decimal Fraction Negative Number Percentage Coordinate Time Equation Geometry Word Problems
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