Plotting normal to a plane 90/40 40 E B Draw the great circle with attitude 90 240. count 90 degree along EW from D,, mark the point P It is the projection of the normal to the plane 90 240Plotting normal to a plane 90 ∠40 Draw the great circle with attitude 90 ∠40, count 90 degree along EW from D’, mark the point P’. It is the projection of the normal to the plane 90 ∠40