-- Add the lengths of the two 'bases' (the two parallel sides).
-- Multiply the sum by the height of the trapezoid.
-- Take 1/2 of the product. That's the trapezoid's area.
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a trapazoid
A trapazoid!
Area = 0.5*(sum of parallel sides)*height
Area = Base * Height so Base = Area/Height
Area in square units = 0.5*(sum of parallel sides)*height