If base of solid is parallel to one of reference planes n its axis perpendicular to that plane and vise versa. Sphere gives all view as circle. Square prism is similar to cuboid. Prism is a polyhedron having two equal and similar faces called its bases.

A polyhedron is defined as a solid bounded by planes called faces. Prism is a polyhedron having two equal and similar faces (bases or ends), parallel to each or and joined by or faces which are rectangles.

The stages are i) keeping in simple position, ii) Axis inclined to one plane and parallel to or, iii) Final position. The `2^(n d)` and `3^(r d)` positions may be obtained eir by alteration of positions of solid i.e. view or reference lines.

As normal a tetrahedron gives equilateral triangle for a project to its base and isosceles triangle for or view when placed without inclination but here inclination is given but given view is top view so shape will not change but rotate to given angle.

Sphere is a closed solid object which is formed by rotating semicircle about its flat side. Sphere gives top view, front view, side views as a circle whose radius is equal to radius of a sphere.

Given a square pyramid which means projection to its base gives square shape and or orthographic views give triangle. Here given is pyramid whose axis is inclined to H.P so its front view will be isosceles triangle and top view will be square.

As normal a tetrahedron gives equilateral triangle for a project to its base and isosceles triangle for or view when placed without inclination but here inclination is given but given view is top view so shape will change to isosceles triangle.

In a cone, straight lines drawn from apex to circumference of base-circle are all equal and are called generators of cone. The length of generator is slant height of cone.