math

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Across
  1. 1. It is four regions divided by the horizontal and vertical axes in the plane rectangular coordinate system (Cartesian coordinate system). Each region is called a quadrant
  2. 3. The quotient of the distance between the vertex of an angle and another arbitrary point on the terminal edge of the angle divided by the non-zero ordinate of the next point
  3. 7. The ratio of the hypotenuse to the adjacent edge of an acute angle is called the secant of the acute angle
  4. 8. The vertex coincides with the origin of the plane rectangular coordinate system, and the initial edge of the angle coincides with the positive x axis
  5. 9. The abscissa of any point on the end edge of any corner except the vertex divided by the non-zero ordinate of the point
Down
  1. 2. the angle between the terminal arm of an angle in standard position and the x-axin
  2. 4. the counterclockwise angle between the initial arm and the terminal arm
  3. 5. When the vertex of an angle coincides with the origin of the plane rectangular coordinate system, and the starting edge of the angle coincides with the positive direction of the X axis
  4. 6. The vertex of this angle coincides with the origin of the plane rectangular coordinate system, and its starting edge coincides with the positive x axis