# Etching and Typography of Geometry Problem 1367: Equilic Quadrilateral, 120 Degrees, Congruence, Midpoint, Diagonal, Equilateral Triangle, iPad Apps

### Proposition

In the figure below ABCD is an
equilic quadrilateral.
Prove that the midpoints E, G, and F of the
diagonals and the side BC always determine an equilateral triangle.

See solution below

### Geometric Art using iPad or Mobile Apps

Geometric art is a form of art based on the use and application of geometric figures. A geometric figure is any set or combination of points, lines, surfaces and solids.

A mobile app or mobile application software is a computer program designed to run on smartphones and tablet computers.

See also:

Original problem
1367.