Let l be a fixed line of the plane and O a fixed point on l, and let k be a given nonzero real number. By the stretch-reflection  we mean the product  where  is the reflection with respect to line l, and  is the dilatation with center O and ratio k. The line l is called the axis of the stretch-reflection, the point O is called the center of the stretch-reflection, and k is called the ratio of the stretch-reflection

For a detailed description of Q (the object created), use the routine detail (i.e., detail(Q))

The command with(geometry,StretchReflection) allows the use of the abbreviated form of this command.