# why 64 is equal to 65 here?

how is this possible? I know there is some trick, should someone please explain?!

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This appeared here in a similar post using triangles rather than squares. The lesson here is that drawings are not proofs. –  Asaf Karagila Oct 27 '13 at 12:00
What program do you need to create such animations? I'd enjoy to make some animated recreational math problems... –  Jeyekomon Oct 27 '13 at 12:06
Note: 面積 = Area, 甲/乙/丙/丁 are labels. one should interpret them as A / B / C / D or $1^{st} / 2^{nd} / 3^{rd} / 4^{th}$ in this question. –  achille hui Oct 27 '13 at 12:06