A British twenty pence coin has seven sides.
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A Bay is a piece of water with land on three sides.
It has 7 sides but they are not flat, they are slightly curved. The coin is designed to have a constant diameter so that vending machines work with it.
A bevelled piece of glass.
A trapezoid has four sides and only has two parallel sides. A rhombus has four sides with all congruent parallel sides. When you combine the two together you get a total of 4 sides. when you add the rhombus to the trapezoid you are basically forming a bigger trapezoid (try it on a piece of paper) which has 4 sides.
7 sides on a Fifty Pence Piece