Sex involving three people. ** This can mean any activity that 3 people are involved in.
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There are more than three measures. Some are better than others in some situations but not as good in other situations.
Yes, three points define a plane. So any three points lie in some specific plane and are therefore co-planar.
Incorrect; some have 4.
Some do, some don't. A regular polyhedron such as the tetrahedron has none whereas an irregular one like the parallelepiped can have several.
3.504 is 'Three point five zero four'. NOT 'three point five hundred and four, as the decimal numbers are being given the incorrect unit name. However, some modern thinking would quote 'three and five hundred and four thousandths'.