初三数学题上(国外英语资料).doc

初三数学题上(国外英语资料) Third math weekend exercise (unit comprehensive test) First, the multiple-choice question 1. of the following figures, not the centrosymmetric figure, is () A. circle, B. diamond, C. rectangle, D. equilateral triangle 2., the following can not constitute a right triangle, three sides of the array is () A. (3, 4, 5), B., C. (6, 8, 10) D. Figure 3. - -1, in ABCD, EF, AB, GH, AD, EF and GH to O, a number of the parallelogram in shape (total) A. 7, B. 8, C. 9, D. 11 4. if the limit is inserted with a regular polygon, in the regular polygon below, one cannot be inserted into a plane A. regular triangle, B. square, C. regular pentagon, D. regular hexagon Figure 5. -2, P Rt ABC BC of the hypotenuse is different from B, a C, a straight line section P Delta ABC, Delta ABC and the triangle cut similar to meet such conditions a total (linear) A. 1, B. 2, C. 3, D. 4 6., swing rope 3 meters long, at rest, stepping board 0.5 meters from the ground, a child swing, swing at the highest point on the board, 2 meters from the ground (about symmetry), the swing of the arc as long as () A. PI B., 2 pi, C. 3 PI, D. 4 pi Figure 7. -3 in radius 5 / O, if AB string length is 8, M is a point on the string AB, OM (long range) A. 3 = OM = 5 = OM = 5, C. B. 4 3OM5 D. 4OM5 Figure 8. -4, PA, PB, O are two tangent point, A, B, OP=4 / AOB, if so, equal to () A. 90 degrees B., 100 degrees C., 110 degrees D., 120 degrees Figure 9. -5, if the inscribed circle is inscribed Yu Zheng Delta A1B1C1 Delta ABC, the value () A. B. C. D. Figure 10. -6 in parallelogram ABCD, angle DAB=60 degrees, AB=5, BC=3, P from the starting point of D, along the DC, CB to set up P B end point motion through the journey to X line segment AD P through AP, surrounded by the graphics area y, y and X change with changes in the following image, can correctly reflect the function relationship between Y and X is () Two. Fill in the blanks 11. the length of both sides of isosceles triangle is 1cm and 2cm, then its ci