A triangle with an inscribed triangle. What fraction of the former does the latter cover in terms of lengths a, b, c, d, e and f?
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The shaded fraction is (ace+bdf)/((a+b)(c+d)(e+f)).
Spiegel im Spiegel
Mirror in the mirror
Arvo Pärts composition
This piece is made for meditation
For a form of contemplation
Piano and violin
Play with tintinnabull
Bells which sound in this melody
Showing new mirrors for tranquillity
Pictures to swallow immediately