Calculation of the area of geometric figures

A certain quadrilateral

a side length (mm)
b side length (mm)
c side length (mm)
d side length (mm)
e diagonal length (mm)
f diagonal length (mm)

Result for the quadrilateral

Quadrangle area:

Triangle

a side length (mm)
b side length (mm)
c side length (mm)

Result for the triangle

Triangle area:

Segment

r radius length (mm)
a chord length (mm)

Result for the segment

Segment area: