1. Move a rectangle along the positive direction of the X axis by m units, and find the area difference of the shadow before and after the movement.
2. A small cube moves along the positive direction of the X-axis, while flipping on the X-axis, and the area ratio of the shadow before and after flipping is found.
3. A square moves around a circle along the positive direction of the Y axis, and the ratio of the shadow areas of the circle and the square is found.
4. Move a square diagonally, and when it finally completely coincides, it just covers an isosceles triangle with an area of S, and find the triangle area of S. ..
5. Move a square along the positive direction of the Y axis, and overlap with another square when moving m units to find the side length of another square.
6. One rectangle moves along the positive direction of the X axis, and there are B units directly above the other rectangle. Find the ratio of the shadow areas of two rectangles.
7. When moving a semicircle to the center of the square along the positive direction of the Y axis, find the shadow area ratio of the square area to the semicircle area.
8. Move a trapezoid along the positive direction of Y axis to a position near the bottom of a large trapezoid similar to this trapezoid, and find the area ratio of the shadow.
9. Move a regular triangle along the positive direction of the X axis, and two adjacent displacements satisfy a arithmetic progression. Move 2 units for the first time and 8 units for the third time to find the side length of the regular triangle.
10. An ellipse moves forward along the Y axis and moves on a rectangle, just passing through the two endpoints of the rectangle. Find out how many units it moved.
I hope these topics are helpful to you!