one-half times height times (sum of bases)
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Area of a trapezoid = 0.5*(sum of parallel sides)*height
Area of a trapezoid = (1/2) x (height) x (length of the base + length of the top)
of course base times height for a square or rectangle. but for a trapezoid a= h x "b1+b2"
Area of a trapezoid = 0.5*(sum of parallel sides)*height
The formula for the area of a trapezoid is A = 1/2 (b1 + b2)/h where b1 is the upper base of the trapezoid , b2 is the lower base of the trapezoid and h is the height of the trapezoid. Since a triangle has only one base , replace either b1 or b2 with zero. Thus the area of a triangle is A = 1/2bh