1. Auxiliary view method

2. Learning outcomes of this video
Use the principles of an auxiliary view to find turning points and intersection points on line of intersection between two surfaces
Applying the principle of producing straight line elements from a pyramid in order to locate a point on a surface.
Show how inclined cutting planes method results in the same solution as auxiliary view method

3. X Y

4. X1 X Y Y1

5. X1
Turning points located on edges of pyramid X Y Y1

6. Inclined cutting plane method
Both auxiliary view method and inclined cutting plane method provide the same solution to the line of intersection X Y X Y
Auxiliary view method
Inclined cutting plane method