If the lengths of the two parallel sides are a and b, and the height of the trapezium (the distance between them) is h, then
area_of_trapezium = 1/2 (a + b) h
that is half of the sum of the lengths of the two parallel sides multiplied by the distance between them.
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a tapezium
To find the perimeter you add and to find the area we multiply.
To find the relationship in width and area you can use the formula area/length = width. To find the area of a room you multiple the length by the width.
HOW TO FIND THE AREA OF A SQUAREmust x all sides
to find the surface area you have to first find the area of each part then add the areas together.