 Hello everyone, I am Rahul Patil, Assistant Professor, Department of Mechanical Engineering, Walshchand Institute of Technology, Solapur. Today we will discuss about projection of rectangular plane. At the end of this session, students will be able to draw the projection of rectangular plane. Now for drawing the projection of rectangular plane, consider a simple problem where problem statement is like this. A rectangular plane A, B, C, D with sides equal to 30 mm and 50 mm has its surface inclined at angle of 30 degree to the HP. One of the sides say A, B is in the HP and makes an angle 40 degree to 45 degree to the VP. Draw the projection. Now read the problem carefully and write down the given data. Now rectangular plane is given with sides 30 mm and 50 mm. This is inclined at 30 degree to the HP and again second it is inclined 45 degree to the VP. So that given statement is like this, sides 30 mm and 50 mm inclination with the HP is given. Remember when inclination with the HP is given it will appear in the VP or you have to draw it in the VP. In other way inclination with VP is given it is drawn in the HP. Now first draw x y axis mark VP and HP. Now draw the primary stage that is square with given dimensions and name it as A, B, C and D. Draw the projectiles from point A, B, C and D where A, B lie on a straight line or a single projectile so that it will appear at a single point. Again similar way C and D is again on single projectile that is why C and D will appear again at a single point. Now join A to C distance this is the front view of the object A, B, C, D. Now in second condition second stage and third stage two conditions are given. One is inclination with HP and inclination with the VP now in second stage which condition is preferred inclination with HP or inclination with the VP. Remember that if object rest in the HP then while drawing the second stage inclination with the HP is drawn. If object rest in the VP then inclination with the VP is drawn it depends on primary position of the object. In first stage if object lie in HP then in second stage inclination with the HP is considered. If first in first stage object lie in VP then inclination with the VP is considered in second stage. Now object is rest in HP so that inclination in second stage inclination with the HP is considered where inclination with the HP is drawn in the VP. So that mark AB point anywhere on this XY axis. Now measure A to C distance and draw a line with the inclination of 30 degree. This 30 degree inclination is drawn with the XY axis and this AC distance must be equal which is appear in the front view in stage first. Now for solving stage number second again draw the projectiles from point A, B, C and D. Here again point A and D will appear on single projectile and point B and C appear on single projectiles. Here you will get projectile just check the combinations point A, point A you will get A point again point B here point B you will get point B again point C and point C you will get third point as a point C again point D and projectile from point D you will get fourth point as a point D. Now you will get four points A, B, C and D join this you will get second stage here second stage of the problem is completed. Now third stage inclination with the VP now inclination with the VP is appear in the HP so drawing third stage first draw a inclination mark which is 45 degree on this incline line draw the AB side so that the second stage must be appear like this where AB must be on 45 degree mark and mark it as A, B, C and D. Now for completion of third stage similar way draw the projectiles from point A, B, C and D here again from point C and D here projectile from point A it is up to the XY axis because AB lie on the XY axis so that A must be on XY axis again point B on the XY axis draw the projectile from point C and projectile from point D up to this projectiles from C and D name it as A projectile from point B projectile from point C and projectile from point D. Again you will get AB, CD in the front view join this A to B, B to C, C to D and D to A here third stage is completed. Now this is the whole solution for the problem where AB, CD rectangle is given inclination with the HP is given 30 degree inclination with VP is given 45 degree these are the references thank you