Axis perpendicular to the vertical plane - tetrahedron:
A tetrahedron of side 60 millimeter has its base parallel to the VP, along with an edge of the base inclined at 45o to the HP. However the corner contained via such edge is on the HP. Sketch its projections.
Construction procedure is given as:
(a) Sketch a line at 45o to xy in VP, and complete the elevation a′ b′ c′ or along with point c′ in xy Mark centre ′.
(b) Sketch line abc parallel to xy representing the base in elevation.
(c) For mark point O in plan, rotate o′ a′ in elevation to o′ to o′a′1 parallel to xy.
(d) Situate a1 along extension line of abc and mark o as or a1 o equal to 60 millimeter along axis.
(e) Connect oa1, ob1, oc1 is like dotted line to finish the plan.