In quadrilateral ABCD, if vector AB = vector DC, it must be () a diamond B parallelogram C rectangle D square

The answer is B ~ because other options have more restrictions besides parallel. For example, a, diamond requires four equal sides. According to the condition of the question, only the vectors AB and DC are equal in quantity. It is impossible to verify whether AD and BC are equal to AB and DC

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1. Is negative OA vector equal to Ao vector? Note that OA is negative, not asking if OA is equal to Ao vector!
2. Is the coordinate of vector Ao the same as that of vector OA?
3. If the vector OA (x, y), then is the vector Ao (- x, - y) Why?
4. Why vector Bo vector Ao = vector Ba?
5. AO*BO=AB?
6. If the vector OA = (3,2) ob = (4,7), then AB =?
7. Known vectors OA = (1,3), OB = (2,5) Given the vector OA = (1,3), OB = (2,5), OC = (m, m), if AB is perpendicular to BC, what is the real number m
8. What does OA vector multiply ob vector = 0 mean
9. Let | vector OA | = | vector ob | = 3, ∠ AOB = 60 °, then | vector OA + vector ob|= By the way!
10. Given vector | OA | = 1, | ob | = √ 3, OA * ob = 0, point C is on line ab Given vector | OA | = 1, vector | ob | = √ 3, vector OA * vector ob = 0, point C is on line AB, and angle AOC = 30 °, find (1) vector OA * vector OC (2) let vector OC = MOA + nob, find the value of real numbers m and n
11. In quadrilateral ABCD, AB is parallel to CD, ab = CD, AC bisects ∠ bad, and quadrilateral ABCD is diamond?
12. As shown in the figure, in diamond ABCD, the diagonal lines AC and BD intersect at point O. if OA = 4 and ob = 3, the perimeter of diamond ABCD is () A. 5B. 12C. 16D. 20
13. It is known that the diagonal BD of diamond ABCD is 7cm, ∠ a = 60 ° and the perimeter of diamond is__ cm. Then why can't he have a long diagonal of 7? Stupid
14. In the trapezoidal ABCD, the module of AB = the module of 2dc, AC and BD intersect at O. if the module of AB = a, the module of ad = B, then OC =? The answer is one sixth a + one third B I want to know the process
15. If ab → = a →, ad → = B →, then OC →= Ab →, DC →, a →, B → and so on are vectors
16. E1E2 is the unit vector, E1 = 1, E2 = 1 why
17. If the vectors E1 and E2 are two unit vectors with an angle of 60 ° in the plane, a = 2E1 + E2, B = - 3E1 + 2e2, then the angle between a and B is?
18. If E1 and E2 are two vectors which are not collinear, a = E1 + Ke2, B = E2 + Ke1, then a / / B is a necessary and sufficient condition The answer is plus or minus one
19. If vector E1 and E2 are not collinear, vector a = - E1 + Ke2, B = ke1-e2, a is parallel to vector B, and the value of K is obtained
20. When k =?, a = Ke1 + E2, B = E1 + Ke2