We start with an assignment.

 

Construct an equilateral triangle ABC with an angle of 120° at B. You will easily find out, that the other angles must be 30° then.

  • Choose the fixed angle tool. Click on A, C and somewhere close to B. In the dialog enter 30 for the size of the angle. You might also enable the display of the size.
  • Then click on C, A and close to B. In the dialog, enter 30 again. Alternatively drag the last point, until the angle is 30° large.
  • Create B with the point tool.

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