What grade is the understanding of plane shape?

The first grade of primary school.

Graphics can be divided into:

(1) plane graphics.

(2) three-dimensional graphics.

1. Plane graphics: square, rectangle, triangle, circle, parallelogram.

2, three-dimensional graphics: cuboid, cube, cylinder, sphere.

Graphic combination

1, two identical triangles can be combined into a parallelogram; Two identical triangles can be combined into a parallelogram, a rectangle or a large triangle.

2. It takes at least 4 small cubes to form a big cube, and at least 8 small cubes to form a big cube.

3. Two rectangles can form a big rectangle. (Two special rectangles can form a big square), and four cuboids can form a big cuboid.