Then we unbend the end of the same lower part back, leaving about two centimeters of its bottom not unbent, as shown in Scheme 6.We bend the lower part of the figure up, as shown in diagram 5.We unbend the upper part of this figure along the dotted lines in the direction of the arrows indicated in diagram 4, thus opening the first corner bent inward.As a result of these actions, a cone-shaped structure is obtained with a top at the bottom On both sides of the folded corner of the sheet, along the dotted lines in the directions of the arrows indicated in Scheme 3, we bend the opposite corners of the rhombus inward, covering the first folded part with them so that an acute angle forms below.
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