The square which is made in a circle such that all four vertices of a square touches circle is called Circumscribed square.

By Pythagoras theorem in triangle BOC

s^{2} = r^{2} + r^{2}

s = √2r

Areas | In terms of radius ‘r’ | In terms of side ‘s’ |

Area of square ABCD with side ‘s’ | 2 r^{2} | s^{2} |

Area of circle with radius ‘r’ | ∏ r^{2} | ∏ s^{2} /2 |