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Circular arc on a part profile is being machined on a vertical CNC milling machine. CNC part program using metric units with absolute dimensions is listed below:

$\begin{array}{} \hline N60& G01 &  X & 30 & Y & 55 & Z & -5&  F50 \\ N70&  G02& X&  50 & Y & 35 & R & 20 \\ N80 & G01 & Z & 5  \\ \hline \end{array}$

The coordinates of the centre of the circular arc are:

  1. $(30, 55)$
  2. $(50, 55)$
  3. $(50, 35)$
  4. $(30, 35)$
in Materials, Manufacturing and Industrial Engineering 24.6k points
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