Plane angle vertical plane method of dihedral angle What is the vertical plane method in the common method of making plane angle of dihedral angle?

Make a vertical plane of the edge. The angle formed by the intersection line of the vertical plane on two planes is the plane angle of the dihedral angle

The basic solution of plane angle of dihedral angle
Dihedral angle of the plane angle. The best illustration

Sorry, there is no graph ~ the main methods are: 1. Make the plane angle of the angle of 2 faces 2. Projective area theorem 3. Normal vector transformation

How to find the plane angle of dihedral angle

It is to find a point in a plane, make a vertical line of another plane, connect this point with the end point of another plane, and the resulting angle is a dihedral angle, or directly make a vertical line to find the projection of the plane, and use the area ratio of the projection to the area of the original plane to be the cosine of the dihedral angle, so it is OK

RELATED INFORMATIONS

1. How to find the plane angle of dihedral angle?
2. Let the eccentricity root of the left focus of the ellipse be 3 / 3, and the length of the line passing through point F and perpendicular to x cut by the ellipse be 4 root 3 / 3 1 elliptic equation Let AB be the left and right vertices of the ellipse,
3. In the triangle PMN with area of 1, Tan ∠ PMN = 1 / 2, Tan ∠ PNM = - 2, a suitable coordinate system is established, and the hyperbolic equation with m, n as the focus and passing through point P is obtained
4. If the angle MPN is known, ad is on PM, C and B are on PN, and a and B intersect CD on F. (1) if pf bisects the angle MPN, the proof is: 1 / PA + 1 / Pb = 1 / PC + 1 / PD; (2) if 1 / PA + 1 / Pb = 1 / PC + 1 / PD, PF bisects the angle MPN
5. Ad bisector ∠ BAC, the vertical bisector of ad intersects the extension line of BC with point E, intersects ad with point F, and proves ∠ EAC = ∠ B Use the vertical bisector of a line segment
6. In the triangular pyramid p-abc, point O is perpendicular to the triangle ABC, and Po is perpendicular to the plane ABC
7. Is the dihedral angle range [0, π / 2], or is the plane angle range [0, π / 2)? Is a dihedral angle a corner? Does it have scope, What is the relationship with the plane angle range?
8. It is known that the angle between line AB and plane a is 30 degrees, the angle between line AC and plane a is 6O degrees, ab = 6cm, AC = 8cm, and the projective ab 'and AC' of oblique line AB and AC in plane a are perpendicular to each other?
9. The slope angle of a hillside is 30 degrees. If one kilometer goes along a straight road with 45 degrees to the slope, the slope will rise A. 250 with 2m b.250 with 3M c.250 with 6m d.500m
10. On a flank slope with an inclined angle of 60 degrees, climb along the road with an angle of 30 degrees to the horizontal line of the slope toe for 100 meters How many meters
11. The intersection of two planes forms the plane angle How many parts of the space are the three planes that do not coincide with each other? Some say 8, some say 7, and 8
12. In the dark house, there is a plane mirror on the table. Behind the mirror is a white wall. When you shine a flashlight on the mirror and the wall, the wall is very bright because the wall has a very good effect on the light______ The mirror is dark because it makes the light shine______ ．
13. It is known that the plane angle of dihedral angle α - ab - β is an acute angle, C is a point in plane α (it is not on edge AB), D is the projection of point C on plane β, and E is the projection of point C on edge ab
14. As shown in the figure, AB and CD are the two chords of circle O. points E and F are the midpoint of AB and CD, connecting EF, angle AEF = angle CFE, and proving AB = CD
15. Given that the coordinates of point P (x, y) satisfy the condition x + y ≤ 4Y ≥ XX ≥ 1, and point O is the origin of coordinates, then the minimum value of | Po | is equal to___ , the maximum value is equal to___ ．
16. (1 / 2) in the pyramid p-abcd, the bottom surface ABCD is rectangular, the vertical plane ABCD of PA, PA = ad = 1, ab = 2, e and F are the midpoint of AB and PD respectively（
17. As shown in the figure, AB is perpendicular to plane BCD, BC is perpendicular to CD, ab = BC, and the angle between AD and plane BCD is 30 degrees Finding the angle between AD and plane ABC Picture in
18. In the circle O, AB is the diameter, the chord CD intersects the circle O at points c, D, and is parallel to ab. the distance between AB and CD is 5, CD = 24, and ab is calculated
19. The square ABCD is folded into a straight dihedral angle along the AC side, and the out of plane line AB and CD form an angle of? Online, etc., urgent, urgent
20. (1) Find the angle formed by the straight lines PD and AB on different planes (2) prove PA perpendicular to CD (3) find the size of dihedral angle p-ab-d In the pyramid p-abcd, the side PDC is an equilateral triangle with side length of 2 and perpendicular to the bottom ABCD, the bottom ABCD is a diamond with area of 2.3, the angle ADC is an acute angle of the diamond, and M is the midpoint of Pb

Plane angle vertical plane method of dihedral angle What is the vertical plane method in the common method of making plane angle of dihedral angle?