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delarosaraul331
To calculate the area of a trapezium, divide it into a rectangle and two triangles as shown below. Now, piece together the triangular ends so that the trapezium is divided into a triangle and rectangle. The base of the triangle is the difference between the lengths of two parallel sides. That is, a – b.
caylus
Hello,
Let assume B' the image of B by the translation DC.

The trapezium ABCD is composed of area I,area II, area III.
Area III is equal to area IV.
the area of a trapezium is equal to area I+ area II+ area IV which is a triangle with base =AB and h the height.
the area of a trapezium= (AB+BB')*h/2=(AB+DC)*h/2



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