App description

\(S= \frac {1}{2} (a+c) \times h=l \times h\)

\(h^2=[(a+b-c+d) \cdot (-a+b+c+d) \cdot (a-b-c+d) \cdot (a+b-c-d)] / (4 \cdot (a-c)^2)\)

Use this calculator to know the 4 sides of the trapezoid

Lines BC and AD are parallel, called the bottom edge

Lines AB and DC are called trapezoidal waists

Lines AC and DB are called diagonals

The line perpendicular to AD and BC is called the height of the trapezoid

Parallel to AD, BC, the line between AB and DC is called the trapezoidal median line

Median line \(l = \frac {AD + BC}{2}\)

Usage example

Input data:

Length = 8

Side b=4

Short bottom = 4

Side d=3

Click "Calculate" to output data

Perimeter = 19

Median line = 6

High =2.7811

Area = 16.686

Angle A=44.049

Angle B=135.95

Angle C=112.02

Angle D=67.976

Diagonal AC=5.831

Diagonal BD=7.4162