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The seventh grade second volume mathematics supplementary answer
1. What is the shape of the side expansion of the heptagon? rectangle

2. A cuboid medicine box with a height of 8cm, a square circumference of 20cm, a surface area of 2 10cm and a volume of 200cm.

3. Starting from a vertex of an n- polygon (n > 3) and connecting these vertices respectively, the N- polygon can be divided into n-2 triangles.