GEOMETRY / PARALLEL BASES
Calculate trapezoid area, perimeter, and median from two parallel bases, perpendicular height, and both legs.
Use boundary
The mean of the parallel bases multiplied by perpendicular height gives area; all four sides provide perimeter.
Area = (base A + base B) x height / 2; perimeter = both bases + both legs.
What you provide
What you receive
Use boundary
The entered dimensions should describe a physically possible trapezoid; area uses bases and perpendicular height while legs affect only perimeter.
Results are educational math aids. Check notation, units, rounding, assumptions, and required precision before using an answer in graded, engineering, financial, or safety-critical work.