### Sonnia Elisabeth Olesen

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**regular tetrahedron**constructed from 4 congruent convex parts; the axis of rotation passes through the**middle-points**of two**opposite edges**of the tetrahedron (each part consists of 1 (green) + 1 (orange) + 3 (blue, pink & yellow)**isosceles trapezoids**plus a**square**, as faces); 4 yellow, 2 blue & 2 pink trapezoids plus the 4 squares are glued together (out) inside the tetrahedron..1

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