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When the clock face rotates 40 ° clockwise, it is recorded as + 40 ° and what does - 40 ° mean
-40 ° means: rotate 40 ° counterclockwise
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- 1. On the clock, turn the clock clockwise from the number "12" to "6" for + 1 / 2 cycle, So, what is the number of the clock face that the hour hand refers to after setting the hour hand from "12" for - 1 / 4 week?
- 2. Judgment question: the ratio of the rotation speed of the hour hand and minute hand on the clock face is 1:60
- 3. The minute hand on the clock goes 60 times faster than the hour hand______ ．
- 4. After the minute hand revolves around the center of the clock face for 3 circles, the hour hand revolves around the center of the clock face ()
- 5. The hour hand from 6 o'clock to 12 o'clock revolves () degrees around the center of the clock face
- 6. On the clock face, if the minute hand rotates one circle, then the degree of the clockwise rotation is______ ．
- 7. How many degrees does the minute hand rotate on the clock face
- 8. On the clock face, if the minute hand rotates for one circle, then the angle of the clockwise rotation is () degrees
- 9. On the clock face, if the minute hand rotates for one circle, how many degrees does the hour hand rotate?
- 10. On the clock face, if the minute hand rotates one circle, then the angle of the clockwise rotation is () degrees
- 11. A round clock face, clockwise from "12" clockwise rotation () to "1"; clockwise from "3" clockwise rotation 120 degrees to ()
- 12. Square ABCD with side length 4, where point a is at the origin, point B is at the positive half axis of X axis, and point D is at the negative half axis of Y axis, what are the coordinates of the four vertices? Such as the title
- 13. The vertex a of square ABCD coincides with the origin of coordinates, and the coordinate of vertex B is (0,4), then the coordinate of vertex C is ()
- 14. Given a (0,4), B (3,0), P (1,0), in the rectangular coordinate system, O is the origin, and the triangle AOB rotates m counterclockwise around point P (M is greater than 0) Less than 180, get the triangle a1ob1, make the point B1 fall on the edge of the triangle AOB, calculate the coordinates of point B1
- 15. As shown in the figure, in the plane rectangular coordinate system, ob is on the x-axis, ∠ ABO = 90 ° and the coordinates of point a are (1,2). Rotate △ AOB 90 ° counterclockwise around point a, and the corresponding point C of point O just falls on a branch of hyperbola y = KX. (1) find the analytic formula of hyperbola. (2) the intersection of the straight line passing through point c y = - x + B and the hyperbola is e, and find the coordinates of point E and the area of △ EOC
- 16. As shown in the figure, in the coordinate system, point a (0,4) and point B (3,0) rotate △ ABO counterclockwise around point o 90 ° so that point a falls on point C on the x-axis and point B falls on point E on the y-axis (1) Verification: AE = oc-ob; (2) find the length of CF
- 17. As shown in the figure, in the coordinate system, point a (0,4), point B (3,0), rotate the triangle ABO point 90 degrees counterclockwise, so that a falls on the x-axis, point C, and point B falls on the y-axis, point E, connecting CE AB is equal to F. we know that AB is equal to 5
- 18. Rotate the triangle ABO 90 degrees counterclockwise around point B
- 19. As shown in the figure, rotate the right triangle abd 90 counterclockwise around the right vertex a to the position of the triangle ACF. The triangle abd is equal to the triangle ACF. The extension of BD intersects CF with point E and connects BC. If the angle FBE = angle CBE, try to determine the relationship between CE and BD (including the position relationship and quantity relationship),
- 20. If a triangle is rotated 90 ° counterclockwise around a vertex, will each corresponding line segment in the original graph and the rotated graph be perpendicular to each other? Is there such a theorem?