How to draw an elliptic equation with the Geometer's Sketchpad, it says to create one or more functions first,

There are more than ten ways to draw ellipses,
According to the ellipse equation drawing ellipse, the general use of parametric equation to draw
For example, X & # 178 / 9 + Y & # 178 / 4 = 1 is transformed into a parametric equation x = 3cost, y = 2sint, (0 ≤ T)

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1. P is a point in the quadrilateral ABCD, connecting PA, Pb, PC, PD and AC, proving s triangle APC = triangle apb-s triangle APD Parallelogram ABCD
2. Given that the image of quadratic function passes through the point (- 1,0) (5,0), the maximum value of the function is 6, find the analytic expression of the function
3. 48 pieces are arranged in a regular hexagon. The number of pieces on each side is equal. How many pieces are placed on each side?
4. As shown in the figure, all quadrangles are squares, and all triangles are right triangles, Please find several figures in the figure so that the sum of their areas is exactly equal to the largest square area. Try to give more than two schemes
5. If you extend the top and bottom of a right angled trapezoid by 5cm, the area will increase by 25cm, and then it will become a square. Find the area of the original right angled trapezoid
6. Why are there few stars when the moon is round and bright? Sometimes there are many stars, but there is no moon? Sometimes there are few stars when the moon is not bright? What does the moon and stars show?
7. On the drawing with a scale of 1:2000, a rectangular building is measured to be 2.5cm long and 1.35cm wide. What is the floor area of this building? Solve with proportion
8. A square is an axisymmetric figure. It has an axis of symmetry ()
9. It is known that vectors a and B are basic units, and vector a is multiplied by vector b = 0. If vector C satisfies | C-A-B | = 1, then the value range of | C | is
10. How to find the angle of a vector? What is its formula? What's the formula for finding the angle between two straight lines?
11. In the selection of quadratic function, the question only gives the right or wrong of the conclusion. Do you need to find the quadratic function expression and ABC according to the image? Is there any other way to find it? What if the image of a quadratic function of a question is on the X and Y axes, but there are no coordinate points?
12. As shown in the figure, the image of quadratic function passes through the point a (- 1,0) B (4,0) C (0, - 2) to find the analytic expression of quadratic function, and judge whether the triangle ABC is true or not
13. How to judge whether a + B + C.A + B-C 2a-c 2a-b is greater than zero if a graph of quadratic function is given
14. How to judge whether a, B and C are positive or negative or equal to 0 according to the image of quadratic function What's more, for example, how can you judge 4A + 3B + C according to the image
15. How to judge whether a, B and C in quadratic function image are greater than or less than or equal to 0
16. The image of quadratic function is known to pass through points a (1 / 2,3 / 4), B (- 1,3), C (2,3), and its analytical formula is______ ?
17. A quadratic function image through a (- 1.0) B (0.5) C (4.5) (1) find the analytic expression of quadratic function (2) find the quadratic function A quadratic function image passes a (- 1.0) B (0.5) C (4.5) (1) Finding the analytic expression of quadratic function (2) Finding the axis of symmetry and vertex coordinates of quadratic function (3) According to the image to answer what value x takes when x ≥ 0 (the image is three coordinates)
18. We know that the image of quadratic function passes through three points a (1,3) B (- 1,5) C (2, - 1) I can't do my homework... Help me...
19. The image of quadratic function passes through three points a (1 / 2,3 / 4), B (- 1,3), C (2,3),
20. Given that f (x) is a quadratic function and the image passes through a (2. - 3), B (- 2. - 7) and C (0. - 3), what is the analytic expression of F (x)