If a cube is intercepted by a plane, what kind of figure can't the shape of the cross section be? A square B triangle C trapezoid D circle why?

It's d-pull, square type, the same cut twice (height and width), oblique cut to the vertex is a triangle, oblique cut to the edge is trapezoid, circle in a plane cut, how can't cut out! Can only cut into a polygon!

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1. The section figure of a cube can be several sides Solid geometry of senior two
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3. As shown in the figure, divide a piece of land into four groups to plant, with the same shape and size (each piece has the same number of points), how to divide it?
4. In the square with side length 6, there is a triangle bef, and the line segments AE = 3, DF = 2
5. The side length of square ABCD is 7 cm, and there is a triangle bef inside it (as shown in the figure). The line AE = 4 cm, DF = 2 cm, then the area of triangle bef is equal to______ Square centimeter
6. The side length of square ABCD is 7 cm, and there is a triangle bef inside it (as shown in the figure). The line AE = 4 cm, DF = 2 cm, then the area of triangle bef is equal to______ Square centimeter
7. The area of a rectangle is 120 square centimeters. EF is the midpoint of BC and CD respectively. How to calculate the area of the shadow?
8. As shown in the figure, it is a square with side length of 6cm. E and F are the midpoint of CD and BC respectively
9. In square ABCB, the side length is 1cm, EF is the midpoint of BC and CD respectively, calculate the area of shadow part! Trouble,
10. The figure on the right is a square with a side length of 6cm. E and F are the midpoint of CD and BC respectively. Find the area of the shadow in the figure
11. What are the shapes of the section of a cube Please complete the answers separately
12. What figure might the cross section of a cube be
13. What shape pattern might the cross section of a cube be
14. How many kinds of unfolded cube without cover are there? Please draw a more detailed picture! Thank you!
15. How many are the expanded drawings of cube? Name them and send them pictures
16. How to draw the expanded drawing of 11 sides of cube
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19. A geometry is made up of small cubes of the same size. The shape of the geometry seen from above is as shown in the figure. The number in the small square represents the number of small cubes in the position. Please draw the shape of the geometry seen from the front and from the left
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