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.