ABCDEFGH is a cube. Which of the following angle is the angle between planes ABGH and ABCD ?

1. 1. (Hold down the right mouse button and drag to change the view angle.) ABCDEFGH is a cube. Which of the following angle is the angle between planes ABGH and ABCD? A CAG B CBG C CGB D DBH

2. 2. (Hold down the right mouse button and drag to change the view angle.) ABCDEFGH is a cuboid. Which of the following angles is the angle between planes ABGH and CDHG? ADHB B AGC C AHD D HAD

3. 3. (Hold down the right mouse button and drag to change the view angle.) ABCD is a square, M is the mid-point of BC, and VO is the altitude of the pyramid. Which angle is the angle between planes VBC and ABCD? A OBV B OCV C OMV D OVM

4. 4. (Hold down the right mouse button and drag to change the view angle.) ABCD is a square, N is the mid-point of AB, and VO is the altitude of the pyramid. Which of the following angles is the angle between planes VAB and ABCD? A ONV B  OAV C  OBV D ABV

5. 5. (Hold down the right mouse button and drag to change the view angle.) In the figure CO is the altitude of the pyramid, AOB = 90, M is the mid-point of AB, OPAB. Which of the following angles is the angle between planes ABC and OAB? A OMC B  OPC C  OAC D OBC

6. 6. (Hold down the right mouse button and drag to change the view angle.) In the figure CO is the altitude of the pyramid, AOB = 90, N is the mid-point of AC, OQAC. Which of the following angles is the angle between planes ABC and OAC? A OAB B  OCB C  ONB D OQB

7. 7. (Hold down the right mouse button and drag to change the view angle.) In the figure, CO is the altitude of the pyramid, AOB = 90. Which of the following angles is the angle between planes OAC and OBC? A AOB B  ACB C  OCA D OCB

8. 8. (Hold down the right mouse button and drag to change the view angle.) In the prism of the figure, ABCD and CDEF are rectangles, BCF = 90. Which of the following angles is the angle between planes ABFE and ABCD? A DAE B  AED C  EAB D FAC

9. 9. (Hold down the right mouse button and drag to change the view angle.) In the prism of the figure, ABCD and CDEF are rectangles, BCF = 90. Which of the following angles is the angle between ABFE and CDEF? A AEF B  DAE C  DEA D ADE

10. 10. (Hold down the right mouse button and drag to change the view angle.) ABCDEFGH is a cube, O is the centre of ABCD. Which of the following angles is the angle between planes ACH and ABCD? A HAC B  DAH C  DCH D  DOH

11. 11. (Hold down the right mouse button and drag to change the view angle.) In the figure, ABCD is a rectangle, M is the mid-point of AB, and VD is the altitude of the pyramid. Which of the following angles is the angle between planes VAB and ABCD? A VAD B  VMD C  VBA D  VBD

12. 12. (Hold down the right mouse button and drag to change the view angle.) In the figure, ABCD is a rectangle, N is the mid-point of BC, and VD is the altitude of the pyramid. Which of the following angles is the angle between planes VBC and ABCD? A VBD B  VND C  VCD D  VBC

13. 13. (Hold down the right mouse button and drag to change the view angle.) In the figure, ABCD is a rectangle, VD is the altitude of the pyramid. Which of the following angles is the angle between planes VAB and VCD? A BVC B  BVD C  AVC D  AVD

14. 14. (Hold down the right mouse button and drag to change the view angle.) The figure shows a right square prism, O is the centre of EFGH. Which of the following angles is the angle between planes BFH and ABCD? A ABF B  CBH C  OBA D OBD