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BBC1 个月
Identifying 2D shapes
They have two dimensions – length and width. A polygon is a closed 2D shape with straight sides that meet at vertices. Polygons can be regular or irregular. If all the straight sides of a shape ...
The Mirror US on MSN21 天
Dad baffled by seven-year-old's homework question that even grown-ups can't solve
He added: "Or, what the shape has – parallel sides, maybe? "But I'd expect (even for second grade) there to be some ...