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The number π is a mathematical constant, the ratio of a circle's circumference to its diameter, commonly approximated as 3.14159. It has been represented by the Greek letter "π" since the mid-18th century, though it is also sometimes spelled out as "pi"
To find the midpoint between two points:The x-coordinate of the midpoint is the average of the x-coordinates of the two points.Similar for the y-coordinate.
An angle does not have a mid point.
Normally it's its centre which is at the mid point of its diameter.