I must convert a isosceles trapezoid to a rectangle in 2-D with a shearing transformation (or with 2 shearing transformations). The isosceles trapezoid is centered in the origin of axes. It is right write:
x' = x + αy y'=y
with α>0 per y>0 , and α<0 per y<0 (then 2 transformations)? And if it's right how can I calculate the parameter α? Otherwise if it is all wrong as I do?