Good day everyone! First of all I want to excuse my self for my english: I don't know it well. But this forum is my last hope. I need to solve the next task: For example, there is a ring: x^2+y^2 I need to colour the area in this ring. I didn't find how to do it by Maple function's. All I found is a function inequal, but it work's only with linear inequalities in two unknown variables, and this is not exacly what I need. I have tried to do it using function implicitplot with option filled=true, but it work's good only with circle(for example, x^2+y^2<>).