Calculation of the area of the trapezoid
Trapezoid is a convex quadrilateral with two sides parallel. Often a condition is added to the definition of a trapezoid that the other two sides should not be parallel. Parallel opposite sides are called trapezoid bases, and the other two are called sides. The middle line is a segment connecting the midpoints of the sides. Here are ways to find the area, suitable for all types of trapezoid.
.Trapezoid area through bases and height
Base of the trapezoid а
Base of the trapezoid b
Trapezium height h
Area of the trapezoid through the midline and height
Middle line m
Trapezium height h
Trapezoid area across sides
Side a
Side b
Side c
СSide d
The area of the trapezoid through the diagonals and the angle between them 
Diagonal d1
Diagonal d2
Angle between diagonals α
Area of the trapezoid through the bases and corners of the base
Base of the trapezoid a
Base of the trapezoid b
Angle α
Angle β