1. Revision Exercise 6 Q.7
Angle between PQR and horizontal

2. Revision Exercise 6 Q.7
Angle between PQR and horizontal
What’s the line of intersection?

3. Revision Exercise 6 Q.7
Angle between PQR and horizontal
What’s the line of intersection? QR

4. Revision Exercise 6 Q.7
Angle between PQR and horizontal
What’s the line of intersection? QR

5. Revision Exercise 6 Q.7
Angle between PQR and horizontal
What’s the line of intersection? QR Q R

6. Revision Exercise 6 Q.7
Angle between PQR and horizontal
What’s the plane PQR? Q R

7. Revision Exercise 6 Q.7
Angle between PQR and horizontal P
What’s the plane QDR?
Isosceles Triangle Q R

8. Revision Exercise 6 Q.7
Angle between PQR and horizontal P
What’s the plane QDR?
Isosceles Triangle Q R

9. Revision Exercise 6 Q.7
Angle between PQR and horizontal P
What’s the plane QDR?
Isosceles Triangle Q R D

10. Revision Exercise 6 Q.7
Angle between PQR and horizontal P
Find a line perpendicular to the line of intersection QR. Q R D

11. Revision Exercise 6 Q.7
Angle between PQR and horizontal P
Find a line perpendicular to the line of intersection QR. Q R D

12. Revision Exercise 6 Q.7
Angle between PQR and horizontal P
∠PXD X Q R X D