| 摘要 |
The toy is in the form of a jig saw puzzle. It is constituted from a square enclosure in which are housed fourteen geometric elements formed from five triangles and nine quadrilaterals.The five triangular elements consist of a standard triangle (1), a right angled triangle (2), an equilateral triangle (3), an isosceles triangle (4) and an isosceles right angled triangle (5). The nine quadrilateral elements consist of a quadrilateral with two opposite right angles (6), an irregular quadrilateral (7), a square (8), a rectangle (9), a parallelogram (10), a lozenge (12), a trapezium (13), a right angled trapezium (13) and an isosceles trapezium (14).
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