On the board, there is a drawing of a circle with an inscribed square. There is also some text written on the board. Can you please transcribe the text and describe the drawing?

Transcription of Text:

• Д/З: R - ?
• Квадрат со стороной
• 4√2

Description of Drawing:

The drawing shows a circle with a square inscribed within it. The vertices of the square touch the circumference of the circle. There is a point marked at the center of the circle, labeled 'O'.