It is a heptagon (7 sided).
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A British twenty pence coin has seven sides.
At risk of being cheeky two twenty pence coins would be 40 pence. If you mean in US dollars then its about 60 cents going up and down depending on the exchange rate.
A 20p and a 5p
8
The 5 pence coin is worth only around 8 cents in US currency, or 5 pence in the UK.