When an object moves or rotates, its () and () remain unchanged

Shape area

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1. The vertices a (- 1,2), B (2,1), C (4,3) of the parallelogram ABCD are known The vertices a (- 1,2), B (2,1), C (4,3) of the parallelogram ABCD are known (1) Find the coordinates of the fourth vertex D (2) Coordinates of the intersection of diagonal lines AC and BD fast
2. Do you have any key points? It's formulas, and some fallible knowledge
3. Pulley blocks. Formula for the number of rope segments
4. The formula of moving pulley in junior high school physics Calculation of mechanical efficiency
5. How to draw the section number of the rope around the movable pulley in the pulley block More detailed Oh! Had better have schematic diagram
6. Junior high school physics knowledge
7. Who can summarize the junior high school physics inside about the pulley block, the lever aspect knowledge? Better be more detailed
8. Summary of all knowledge points of junior high school physics The knowledge points are clear, don't copy, summarize well,
9. Junior high school physics on the rod, pulley, some knowledge of mechanical efficiency It's better to be more detailed, formula, definition of everything! And hope to add some ideas to do this kind of topic
10. G = mg, what does the formula mean?
11. According to the design requirements, the distance between the transmission tower P and two towns a and B must be equal, and the distance between the transmission tower P and two expressways m and N must also be equal. Please make the location of the transmission tower P in the drawing. (ruler drawing, do not write the method, keep the trace of drawing.)
12. Mathematical problems (solving linear equation with one variable) Xiaoming's telephone number is 7 digits, the first four digits are 6798, and the last three digits are three consecutive integers from small to large, and the sum of these three digits is twice the last digit
13. A construction site digs a rectangular foundation and draws it on the plan with a scale of 1:2000. The length is 6cm and the width is 4cm. What is the area of this foundation?
14. Step into the new curriculum page 120-122 emergency
15. Imagination composition
16. It is known that △ ABC ∽ a ′ B ′ C ', the difference of their perimeter is 20, and the area ratio is 4:1. The perimeter of △ ABC and △ a ′ B ′ C' can be calculated
17. The bottom of a trapezoid is 8 cm. If the upper bottom is extended by 6 cm, the area will be increased by 9 square cm and become a parallelogram. Then the area of the original trapezoid is smaller
18. In the triangular pyramid p-abc, PA is perpendicular to the plane ABC, ∠ BAC = 60 °, PA = AB = AC = 2, and E is the midpoint of PC The cosine of the angle between AE and Pb and the volume of a-ebc are calculated
19. It is known that the sum of the right sides of a right triangle is equal to 8. What is the maximum area of the right triangle when the two right sides are equal to each other?
20. Prove that the image of y = x + 1 / (x-1) is a centrosymmetric graph, and find its symmetry center. Find the process. Thank you