5 triangoli isosceli con angolo multiplo di 20°

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5 triangoli isosceli con angolo multiplo di 20°
Zellige 970+964
Un nonagono con 9 triangoli isosceli di angolo 100° forma un ennagramma ottuso {9/2}.
Zellige 964 - Triangolo 9
Triangolo isoscele con angolo 100°.