The figure shows a regular pentagon
ABDE inscribed in a circle. If point F is on arc BC, prove that
a + d = b + c + e.
View or post a solution.
Geometry software that can be used to learn and
research:
Geometry Expressions, Cabri, Cinderella, GeoGebra,
Geometer Sketchpad, C.a.R., TracenPoche, Mathematica.
See also:
Ptolemy's Theorem
Pentagons
