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I have start point $(x_1,y_1)$ and an end point $(x_2,y_2)$ and radius of arc. How to calculate the co-ordinates of mid-poing of arc? The arc is the part of a circle.

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Known Values

length of AD // that is radius B(x,y) C(x,y) 

Needs to find

D(x,y)  // D is the mid-point of arc BC 
  • 1
    @coure2011 - There's no need to yell. You want help, right? Regardless, if you have the midpoint of the line segment `BC`, how can you use that to get the midpoint of the arc?2012-01-03

2 Answers 2

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Try the arc midpoint computation shown at: http://mathcentral.uregina.ca/RR/database/RR.09.10/akulov2.html