an English fifty pence piece
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they aren't used in real life, not unless you need them in a situation were you would need to use them.
natural numbers are used in real life for counting, adding, subtracting and even for calculting money purposes
Close to infinitely many.
Roller Coasters
If you have to hang a picture or something on the wall.
All seven sided polygons are known as "heptagons". Heptagons that have all side lengths the same are known as "regular heptagons".
Proportions are used in real life to determine prices of things.
Believe it or not, school is a real life situation. If you are using it in school it real life for you.
7
no
Yes.
They can if they are regular.
If you are in school and are studying trig then you are using trig in real life.
Real useing you house.
Not regular heptagons.
25
For two 7 sided regular heptagons to be congruent they must be identical in shape and size.