Area = 0.5*(sum of parallel sides)*height
Note: A trapezium in the UK is known as a trapezoid in the USA
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1 - (a+b) X h 2
Area = (1/2)*(sum of the parallel sides)*(distance between them)
A trapezium is a quadrilateral (has four sides). Two sides are parellel, but the other two are not. To find the area of it, the formula is: 1/2 h(a+b)
First you write the formula for the area of a trapezium, either from memory or by looking it up. Then you substitute the lengths of the sides in your trapezium for each of the appropriate terms in the formula. Oh, all right: Area = 1/2 (height) x (length of base-1 plus length of base-2).
Area = a [(b1 + b2)/2]a = altitude (height) of the trapezoidb1 = length of one baseb2 = length of the other base