> with(plottools);with(plots);

> pie := plottools[pieslice]([0,0],1,Pi/5..Pi/2,color=yellow):

> txt1 :=textplot({[.5,.95,`y = arcsin(x)`],[.3,sin(Pi/5)+.05,`x = sin(y)`]});

> plt := plot([[0,sin(Pi/5)],[cos(Pi/5),sin(Pi/5)]],thickness=2,color=blue):

>

>

> plots[display]([pie,txt1,plt],scaling=constrained);