While drawing projections in 1^st stage front view and top view will be eir line or circle and in 2^nd stage front and top view will be line and ellipse and in 3^rd stage front and top view will ellipse both.

Given a rectangle is perpendicular to horizontal plane and inclined to profile plane so traces would meet on line formed by an intersection of profile plane and horizontal plane or point of intersection of all planes.

If a plane is parallel to vertical plane n top view and side view gives a line and front view gives true shape. If a plane is parallel to horizontal plane n front view and side view gives a line and top view gives true shape. If a plane is parallel to profile plane n top view and front view gives a line and side view gives true shape.

When a plane is perpendicular to a reference plane, its projection on that plane is a straight line. When a plane is parallel to a reference plane, its projection on that plane shows its true shape and size.

The plane which is perpendicular to both reference planes (horizontal and vertical plane) is called profile plane or picture plane. The planes parallel to se have a top view and front view as straight line.

Given an ellipse parallel to vertical plane so plane containing ellipse is perpendicular to horizontal plane and profile plane. The top view and side view gives a line and front view gives true shape and size of hexagon. As object is ellipse which has major and minor axis views show different lengths.

Explanation:

Triangle is a closed plane figure having 3 no. of sides and 3 no. of angles.

Additional InformationQuadrilaterals

• Square- All sides equal and all angles right angles.
• Rectangle or oblong- Opposite sides equal and all angles right angle.
• Rhombus- All sides equal, but angles are not right angles.
• Rhomboid- Opposite sides equal and parallel, but angles are not right angles.
• Trapezoid- Only two sides parallel.
• Trapezium- No sides parallel, but may have two of its sides equal. When two of sides are equal, it is called a trapezium or kite. Polygons: Regular and irregular; when all sides are equal, it is a regular polygon, orwise irregular.

Explanation:

Rhombus:

A quadrilateral whose opposite sides are parallel and equal but not right angles. In a rhombus 4 sides are equal.

Additional Information

Trapezium:

A quadrilateral has only two opposite sides parallel and or two sides are not parallel.

Rectangle:

It is a special case of a parallelogram whose opposite sides are parallel and equal and angles are right angles.

If a circle is parallel to one of reference plane projection parallel to plane gives true shape and size but here plane is inclined so circle transformed to ellipse. If observer also inclined along with plane circle will remain circle only.

Just by visualizing we can get picture and n as base is parallel to xy reference plane side view and front view will be a line and front view gives line of length equal to side of triangle given and side view gives height of triangle.