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the three parts can be turned, and are called $a, b \text{ and }c$, and part $a$ can form an isosceles triangle with part $b$, part $c$ with $b$, and $a$ with $c$, without leaving any hole or superposition

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  • $\begingroup$ Please show your attempts. $\endgroup$ – Matteo Aug 21 '19 at 15:37
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    $\begingroup$ Too hard to parse what you mean. Please either include a picture or be more explicit with you description. It seems you are asking about a triangle with a vertex of $45$ degrees (and therefore the base angles will each be $67.5$ degrees) but what does "turning" mean and what does "$a$ can form an isoceles trianglel with $b$" mean? $\endgroup$ – fleablood Aug 21 '19 at 15:42
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i already solved it so i will answer myself

enter image description here

the drawing is not exact because i made it with paint, but it makes sense on paper, notice that the triangle A with B is isosceles, B with C is also isosceles and B is equal to C so A can form an isosceles triangle with C if C is rotated

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