What is the length of the radius of the circleGeometry Level pending
ABCD is a cyclic quadrilateral.
AB = 9 cm BC = 7 cm CD = 6 cm AD = 2 cm
Find the length of the radius of the circumcircle of this quadrilateral in centimetres.
Type in the square of the length of the radius into the answer box as a decimal fraction.
If there is not enough information given in the diagram to find the length of the radius, type in -1 as the answer.