Square Inscribed in a Circle

Draw a circle of 60 mm diameter and inscribe a circle in it.

 

• Let the square is ABCD.
  
• Draw a circle of diameter 60 mm.
  
• Draw two diagonals AC and BD, mutually perpendicular to each other.
  
• Join the points A, B, C, D and A by straight lines in order to complete the square ABCD.