Anyone can answer these questions...
tangents PA and PB are drawn from an external point P to two concentric circles with centre O and radii 8cm and 5cm respectively. if ap = 15cm , then find the length of BP
a quadrilateral ABCD is drawn to circumscribe a circle. prove that AB + CD = AD + BC
the number integers which has not perfect square between16^2 and 17^2 is