Create and expression for *x* and *y * by using the sum of angles of a pentagon . Cut the pentagon into an isosceles triangle and a quadrilateral. Use angle in opposite segment of a cyclic quadrilateral to find the value of the third variable *z. *Use the value of *z* to find the value of *x* and of *y*.

Elementary Math (emath) tuition at Woodlands, Choa Chu Kang, Yew Tee, Sembawang and Yishun.