A trapezoid (also
known as a trapezium in British English) is a quadrilateral with two parallel
sides of different lengths. This means that both of these sides can be called a
base, and that the trapezoid is unique in having two bases. If want to know how
to calculate the area of a trapezoid, just follow these steps.
Steps
1
Identify
the length of both bases. The
bases are the two parallel sides of the trapezoid. Let's call them sides a and b. Side a is
8 cm long and side b is 13 cm long.
2
3
Identify
the height of the trapezoid. The height of the trapezoid is perpendicular to the bases.
In this example, the height of the trapezoid is 7 cm
4
Multiply
the sum of the lengths of the bases by the height. The sum of the lengths of the bases is
21 cm and the height is 7 cm. 21 cm x 7 cm = 147 cm2.
5
Divide
the result by two. Divide 147 cm2 by
2 to get the final answer. 147 cm2/2 = 73.5 cm2. The area
of the trapezoid is 73.5. You have just followed the formula for finding the
area of a trapezoid, which is [(b1 + b2) x h]/2.
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