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As shown in the figure, which two straight lines are cut by which one respectively for ∠ 1 and ∠ 2, ∠ 3 and ∠ 4? What are their angles?
In Figure 1, ∠ 1 and ∠ 2 are the internal stagger angles formed by the straight lines DC and ab cut by dB, ∠ 3 and ∠ 4 are the internal stagger angles formed by the straight lines AD and BC cut by BD; in Figure 2, ∠ 1 and ∠ 2 are the same position angles formed by the straight lines DC and ab cut by CB, ∠ 3 and ∠ 4 are the same side internal angles formed by the straight lines AB and BC cut by AC
RELATED INFORMATIONS
- 1. As shown in the figure, which two straight lines are cut by which one respectively for ∠ 1 and ∠ 2, ∠ 3 and ∠ 4? What are their angles?
- 2. In a triangle, if an acute angle equals 30 degrees and one side equals half of the other side, it is proved that it is a right triangle
- 3. If an angle of a triangle is 30 degrees and the corresponding side of an angle is half of the other side, is the triangle a right triangle?
- 4. Prove that the side opposite the 30 degree angle is equal to half of the third side, then the triangle is a right triangle How can I spell 60 degrees
- 5. In a triangle, an angle = 30 ° and the opposite side is equal to half of the other side. Find out if the triangle is a right triangle
- 6. Square 7 equals 24 Triangle, the biggest triangle is (), and the square is ()
- 7. 1 star plus 2 triangles plus 3 squares equals 18, 1 star plus 3 triangles plus 3 squares equals 24, how many triangles is it?
- 8. Triangle divided by circle equals 3, triangle minus circle equals 4, triangle equals how much? Circle equals how much?
- 9. How much is a triangle divided by a circle equal to 3? How much is a triangle minus a circle equal to 12
- 10. Given that circle plus circle = 90, triangle times circle equals 90, square divided by triangle equals 90, then how much is square equal to? The volume of a cylinder is 6.28 cubic decimeters larger than that of a cone with the same base and height. What is the volume of a cone?
- 11. As shown in the figure, which two straight lines are corner one and corner two, corner three and corner four cut by which one? What angles are they?
- 12. Place the cube dice (the number of points on the opposite side is 1 and 6, 2 and 5, 3 and 4 respectively) on the horizontal table top, as shown in Figure 1. In Figure 2, roll the dice 90 ° to the right, and then rotate it 90 ° counterclockwise on the table top to complete a transformation. If the initial position of the dice is shown in Figure 1, the number of points on the upper side of the dice after 10 consecutive transformations according to the above rules Yes () A. 6B. 5C. 3D. 2
- 13. As shown in the figure, in the square grid of 4 * 4, what is the size relationship of ∠ 1, ∠ 2, ∠ 3?
- 14. As shown in the figure, in the square grid, the tangent value of ∠ AOB is___ ．
- 15. In the square grid, ∠ AOB is placed as shown in the figure, then sin ∠ AOB = () A. 55B. 255C. 12D. 2
- 16. Fill 3,0,6,9 in the square so that the sum of the three numbers in the horizontal, vertical and oblique squares is equal to 15,12,9,6,3
- 17. Use - 2. - 1.0.1.2.3.4.5.6. Nine numbers are horizontally, vertically and obliquely in nine squares. The sum of three numbers equals Is there any rule in this kind of calculation
- 18. Add 2468 12141618 horizontally, vertically and obliquely to be equal to 30. Fill 2468 12141618 in 9 squares and repeat one number
- 19. Fill - 1,2, - 3,4, - 5,6, - 7,8, - 9 in the box so that the three numbers of each diagonal in each row and column satisfy two conditions Condition 1: the multiplication of 3 numbers is negative Condition 2: the sum of absolute values of 3 numbers is equal
- 20. In the six by six grid, fill in the 36 numbers of 1 ~ 36, so that each row, each vertical line and each diagonal line are equal to 111