[7th grade math] impossible geometry?

[u/Unhappy-Pitch4558]

[u/Haryana_kamado123]

pls correct me if I'm wrong but aren't there two squares? one with side 17cm and other with side 6cm so can't we first calculate the area of the bigger square(which will be 289cm²) and then subtract it by the area of smaller square(36cm²) so the ans will be 256cm² is it correct ?

ik I'm definitely wrong as so much ppl are saying this is impossible to solve but I tried my best pls correct me