elfhoek angolul

hendecagon▼(geometry)
noun
[UK: hen.ˈdek.ə.ɡən] [US: hen.ˈdek.ə.ɡɑːn]

undecagon▼(11-sided polygon)
noun
[UK: ˌʌndɪkˈaɡən] [US: ˌʌndᵻkˈæɡɑːn]