yes, kondrat-nettle. i'm very surprised, to be honest. question from the chest.. sixth question: what is the sum of the angles of a convex heptagon? angelina, i’ll assume 360°. 360, that is, well, yes, uh, no, that's the wrong answer. sofia, perhaps 900°, but as you thought, you can be curious, the formula, in my opinion, is 180 multiplied by in brackets 7 minus 2, 7 is the number of angles, absolutely correct and formula, and the answer is 900°. i'm shocked, i didn't know this. the seventh question is what is the name of the element of the electrical circuit that serves to close and open it. video and it's called batik, batik? yes, but no, this is not batik, arina, painting, just painting, well, no, if everything was so simple, this question would not be in the third round, alas, sofia, enis, will you have versions, there is no version , therefore, this question goes to the teachers' room, yulia, you have the floor, we also find it difficult to answer, so we pass the floor back to the main platform, thank you, then i i’ll enlighten you a little, geta are unique.