\(PQRST\) is a regular pentagon. \(R,U\) and \(T\) are points on a circle, centre \(O\). \(QR\) and

\(PQRST\) is a regular pentagon. \(R,U\) and \(T\) are points on a circle, centre \(O\). \(QR\) and - চর্চা