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Ok, v forme. In my language triangle, but... Ok.

No, in your language, in Chinese, Mongolian, Polish or Zulu a triangle has three sides, how many sides do you see? I see 2.
Ні, у вашій мові, китайською, монгольською, польською чи зулуською, трикутник має три сторони, скільки сторін ви бачите? Я бачу два

I'm very sorry, i'm stupid. Ok?
But in my country people say: geese or cranes fly a triangle, what can I do about it?

In my country people also say idiotic things, I just dont repeat them.
You are not stupid, you are just deeply uninformed apparently.
Nothing wikipedia can't solve: https://en.wikipedia.org/wiki/Triangle
https://uk.wikipedia.org/wiki/%D0%A2%D1%80%D0%B8%D0%BA%D1%83%D1%82%D0%BD%D0%B8%D0%BA

Triangle
A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry. A triangle with vertices A, B, and C is denoted

    △
    A
    B
    C
  

{\displaystyle \triangle ABC}

.
In Euclidean geometry any three points, when non-collinear, determine a unique triangle and simultaneously, a unique plane (i.e.

If I correct for you in my post a triangle on V, will it suit you?
I specifically looked for examples in our literature and found them, but I think this will not help me

No, finding examples of moronic statements wont help you, I can also find thousands of examples of people saying inaccurate and ridiculous things in my literature.
Yes, it would be nice if you replace "Why do birds fly in a triangle?" with "Why do birds fly in a V formation?"

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