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English[en]
The dart may be bisected along its axis of symmetry to form a pair of obtuse Robinson triangles (with angles of 36, 36 and 108 degrees), which are smaller than the acute triangles.
Finnish[fi]
Myös sillä on symmetria-akseli, joka jakaa sen kahdeksi tylppäkulmaiseksi Robinsonin kolmioksi, joiden kulmat ovat 36, 36 ja 108 astetta.

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