a door, window, computer screen. -apex
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A fjord is a real world example of a fjord! They exist in the real world.
A concave quadrilateral. An arrowhead or a delta, for example.
Simple! There are quadrilaterals everywhere. Streets, windows, buildings, anything that is square, rectangular, or has 4 sides on it.
2 is a real world prime number.
a example of a hendecagon is a hedecagon