Typography of Geometry Problem 1038: Isosceles Triangle, Angle, 80, 20, 25, 65 Degrees, iPad Apps

Proposition

The figure below shows an isosceles triangle ABC with AB = BC, angle B = 20 degrees, D on BC and E on AB. If angle CAD = 25 degrees and angle ACE = 65 degrees, find the measure of angle CED. An "elegant" solution must use only elementary geometry, no trigonometry.

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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 1038.