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. (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. (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. (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. (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. (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. (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. (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. (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. (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. (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. (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. (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. (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