Question

The recommended symbol for
indicating the angle of projection shows two views of the frustum of a

Answer 1

The recommended symbol for indicating the angle of projection shows the two views of the frustum of a cone.

Explanation: Two pictures of a solid cone with the tip chopped off are used as the projection sign for the first angle projection. What you'd see if you looked at the cone from the left is drawn to the right of the front face of the cone's design.