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.

www.answers.com/Q/Which_British_coin_is_a_heptagon

The British 20 Pence and 50 Pence coins are both heptagons.

24carat.co.uk/fiftypencestory.html

Reverse of 1998 Britain's 25th Anniversary of EU Membership Fifty Pence ... The
last coins of the old £sd system to be issued for circulation were dated 1967, and
the first decimal coins were ... It was the world's first equilateral curve heptagon.

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

50p coin. 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 ...

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.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,.

news.bbc.co.uk/onthisday/hi/dates/stories/october/14/newsid_3151000/3151539.stm

It is the third decimal coin to be introduced into the British currency which goes
totally ... Today's new arrival, made of cupro-nickel, is the only heptagonal coin in
...

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.openbookpublishers.com/htmlreader/978-1-78374-142-7/Chapters/P6.html

Problem 6: The regular Reuleaux heptagon (✓ ✓ ) 1987 Specimen Paper I. PIC.
The diagram shows a British 50 pence coin. The seven arcs A B , B C , … , F G ...