30-degree regularly-triangular pyramid combination ball

Abstract

The invention relates to a manufacturing method of solid figures, in particular to a 30-degree regularly-triangular pyramid combination ball made by inserting and combining 30 equal parts. Rectangular paper with a length-to-width ratio of 1:0.449 is folded into a parallelogram according to a left angle bisector upward-folding line and a right angle bisector downward-folding line; the parallelogram is folded into a superposed rectangle according to an upper connection line upward-folding line and a lower connection line downward-folding line; the rectangle is then folded into a part; an insert portion of the first part is inserted into a receiving opening of the second part, the second part is inserted into the third part, the third part is inserted into the first part, and accordingly a regularly-triangular pyramid is made by inserting; a pentagonal set is made up of five regularly-triangular pyramids; each triangularly-triangular pyramid serves as one in three pentagonal sets; after inserting is made, a ball of 20 regularly-triangular pyramids is formed, namely the 30-degree regularly-triangular combination ball. The 30-degree regularly-triangular pyramid combination ball is novel in design; manufacturing, requiring fine calculation, of the 30-degree regularly-triangular pyramids is simplified and facilitated; the combination steps are regular and smooth; the 30-degree regularly-triangular pyramid combination ball is both attractive and solid in appearance.

Description

technical field [0001] The invention relates to a method for making a three-dimensional shape, in particular to a method for making a synthetic sphere. Background technique [0002] At present, there are few known manufacturing methods of a regular triangular pyramid composite ball with an angle of 30 degrees. Among the rare methods, most of them are relatively complicated, and the rare simple and easy methods are rare. Contents of the invention [0003] In order to overcome the shortcomings of the existing 30-degree angle regular triangular pyramid composite balls, there are few methods, and among the rare methods, they are more complicated, and the rare simple and easy methods are insufficient. The present invention provides a kind of 30-degree angle regular triangle pyramid composite ball. method. [0004] The technical solution adopted by the present invention to solve the technical problem is: a 30-degree-angle regular triangular pyramid composite ball is formed by p...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of the existing 30-degree angle regular triangular pyramid composite balls, there are few methods, and among the rare methods, they are more complicated, and the rare simple and easy methods are insufficient. The present invention provides a kind of 30-degree angle regular triangle pyramid composite ball. method

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