The vertex coordinates of the quadrilateral are a (- 1,4) B (2,2) C (4, - 1) d (- 2, - 2) respectively to find the area of the quadrilateral ABCD

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• 1. As shown in the figure, quadrilateral ABCD and quadrilateral aefc are two rectangles, and point B is on the edge of EF. If the area of rectangle ABCD and rectangle aefc is S1 and S2 respectively, what is the size relationship?
• 2. It is known that the coordinates of the four vertices of the quadrilateral ABCD are a (1.2), B (4.3), C (3.6), D (0.5). Judge whether the quadrilateral ABCD is a square and explain the reason
• 3. 1+2-3-4+5+6-7-8…… -1983-1984+1985+1986=? This question 1 + 2-3-4 + 5 + 6-7-8 -The calculation process and results of 1983-1984 + 1985 + 1986 are given by the disjunction formula
• 4. 999.99 (of 100 9) * 999.99 (of 100 9) + 99.99 (of 100 9) 999.99 (100 9 in total) * 999.99 (100 9 in total) + 199.99 (100 9 in total) How many zeros in all? Note: the last one is 1999... 9 (100 9S)
• 5. What's ten and a third Be in a hurry
• 6. What is the tenth item if all are divided by 9 and the rest are arranged from small to large? The sooner the better!
• 7. How to say purchasing in English It's words, not sentences~
• 8. 0.125 + 3.7 × 1 / 8 + 1 / 8 × 5.3=
• 9. Seven and a half divided by a quarter emergency
• 10. An old man said, "add 12 to my age, divide by 4, subtract 15, and multiply by 10. It's exactly 100 years old." do you know how old the old man is now? How do you figure it out?
• 11. The coordinates of each vertex of the quadrilateral ABCD are a (0.0), B (3.5), C (12.8) and D (15.0). Find the area of the quadrilateral
• 12. Given that point a (1,2) and point B (5,6) are of length 1, the segment CD moves on the x-axis. When the perimeter of quadrilateral ABCD is the smallest, the coordinate of point D is ()
• 13. There are two points a (1,7) and B (3,4) in the plane rectangular coordinate system. How to find a point C and D on the x-axis and y-axis to minimize the perimeter of the quadrilateral ABCD?
• 14. As shown in the figure above, the coordinates of the four vertices of the quadrilateral ABCD are a (- 2,0), B (1,7) and C (5,5) As shown in the figure above, the coordinates of the four vertices of the quadrilateral ABCD are a (- 2,0), B (1,7), C (5,5) D (7,0) tries to find the area of this quadrilateral; As shown in the figure above, the coordinates of the four vertices of the quadrilateral ABCD are a (- 2,0), B (1,7), C (5,5) D (7,0) try to find the area of this quadrilateral;
• 15. (2010 Hebei) the vertices a and B of rectangle ABCD are on the number axis, CD = 6, the number corresponding to point a is - 1, then the number corresponding to point B is -. I think it is 5 or - 7
• 16. As shown in the figure, the vertices a and B of rectangle ABCD are on the number axis, CD = 6, and the number corresponding to point a is - 1, then the number corresponding to point B is______ ．
• 17. As shown in the figure, the vertices a and B of rectangle ABCD are on the number axis, CD = 6, point E is the midpoint of AB, and the digit corresponding to point a is - 1, then the number corresponding to point E is
• 18. As shown in the figure, the vertices a and B of rectangle ABCD are on the number axis, CD = 6, and the number corresponding to point a is - 1, then the number corresponding to point B is______ ．
• 19. As shown in the figure, the rectangle ABCD with the length of 2 and the width of 1 rotates 90 ° clockwise with the top of the lower right corner as the center, and the coordinate of point a is_______ . turn 2 in turn The rectangle ABCD with length of 2 and width of 1 is rotated 90 ° clockwise with the vertex in the lower right corner as the center, and the coordinate of point a is_______ . rotate 2009 times in turn, then the coordinate of vertex A is________ .
• 20. 2. (2010 Qingdao, Shandong Province) fold a rectangular piece of paper (rectangular ABCD) as shown in the figure, so that vertex B and point d coincide, crease