amc-2014-im-15

Ten points \(Q\), \(R\), \(S\), \(T\), \(U\), \(V\), \(W\), \(X\), \(Y\) and \(Z\) are equally and consecutively spaced on a circle.

What is the size, in degrees, of the angle \(\angle QTW %speech% ,QTW,\)?