At least two constellations: Triangulum, and Triangulum Australe.
a washer
sphere
convex
Constellation.
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Pentagon
A decagon.
toroid
The Arctic was named after the constellation Ursa Major, which means "Great Bear" in Latin. The brightest stars in this constellation form the shape of a bear, which is where the name originated.
Aquilla is the Latin name for 'Eagle' - which the shape of the constellation roughly represents.
octagon
a cube or cuboid