1. Draw a circle with centre O and radius equal to 3 cm.
2. Draw a diameter AC.
3. Draw another diameter BD which bisects AC at rt. ∠s.
4. Join AB, BC, CD and DA
5. Now draw tangents to the given circle at the points A, B, C, D and let them meet at P, Q, R, S. Then PQRS is the required square about the given circle.