How come 32.5=31.532.5 = 31.5? (The “Missing Square” puzzle.)

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Below is a visual proof (!) that 32.5=31.5. How could that be?

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(As noted in a comment and answer, this is known as the “Missing Square” puzzle.)

Answer

Overlay the two triangles to see the difference. This is known as the missing square puzzle.

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Attribution
Source : Link , Question Author : Mehper C. Palavuzlar , Answer Author : obataku

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