Here are some shapes with area 144 and their solutions :
According to the piece(s) which rest(s), we indicate the solution using the following codes :
For the above rectangle R(4r,9), we say that the solution is a a2-solution ; so we can try find a1, b1, a or b-solution.
D(r,3) : a1-solution
TT(7r/r) : a2-solution
Les 3 piques :
Les 2 piques : a1-solution
HE((2r,4r)/12)unu : a2-solution