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.
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A British twenty pence coin has seven sides.
two fifty pence 100p=£1. £100/50p=2
8
eleven 0.55 / 0.05 = 11
50 pennies or fifty cents are in a fifty cent piece or a half dollar.