en.wikipedia.org/wiki/Fifty_pence_(British_coin)

The British decimal fifty pence (50p) coin – often pronounced fifty pee – is a unit
of currency equaling one half of a pound sterling. It is a seven-sided coin formed
as an equilateral c...

www.royalmint.com/discover/uk-coins/seven-sides-of-a-50p-coin

Since the introduction of the 50p coin in 1969 it has become one of the most ... It
was the world's first seven-sided coin, in the shape of an equilateral curve
heptagon. ... to be the best for distinguishing the coin from the rest of the UK
coinage.

matheminutes.blogspot.com/2011/12/what-shape-is-20-pence-piece.html

Dec 28, 2011 ... All but two UK coins are circular. The 20p and 50p pieces are ... This would
indicate that it might be a regular heptagon. However, these edges ...

www.mathscareers.org.uk/article/round-money/

The British 50p coin, like the 20p coin, has a rather unusual shape. It is an
equilaterally curved heptagon. That is, it has seven equal sides, all of which are ...

www.britishmuseum.org/pdf/How_do_you_construct_a_50p.pdf

Students will construct a reuleaux heptagon and then analyse the shape ...
search for a solution using reasoned argument. Equipment required. •. 50p coins.

www.kidsmathgamesonline.com/facts/geometry/2dpolygonshapes.html

Enjoy learning about 2D polygon shapes with our range of interesting facts. ...
The British 50 and 20 pence coins are curved heptagons. An octagon is an 8 ...

www.mei.org.uk/files/pdf/mm/april-2014.pdf

down. UK 50 and 20 pence coins are not regular heptagons, since each of the
seven sides is curved not flat. These coins are regular curvilinear heptagons,.

broom02.revolvy.com/main/index.php?s=Fifty pence (British decimal coin)&item_type=topic

The British decimal fifty pence ( 50p ) coin – often pronounced fifty pee – is a unit
... It is a seven-sided coin formed as an equilateral curve heptagon, a curve of ...

hobbylark.com/collecting/Check-your-UK-change

Apr 18, 2016 ... The heptagon-shaped fifty-pence piece has been issued with more
commemorative designs than any other UK coin, and as designs are issued ...

www.royalmintmuseum.org.uk/coins/british-coinage/current-coins/twenty-pence-coin/index.html

Jun 9, 1982 ... To make the new coin easily distinguishable, it was given the shape of an
equilateral curve heptagon – the same as a 50p. With its constant ...