Мафия 13. Inanimate Paradise

a half-burnt cake: there was grated chocolate and cocoa on top, the consistency suggested condensed milk, and on the top of this masterpiece was a real pearl, resting against a chocolate triangle; behind the pearl, chocolate was smeared in the shape of two trapezoids – the rest had been eaten.

What kind of geometry lesson is this? What can these shapes tell us? Could it be a direct description of something? Could this be a clue to the killer's identity? Or the victim's? There's this question...

But overall, it's difficult to read... difficult to understand... But there's nothing else to do – we're looking for clues!