These are the geometric perspective drawings,the first one is a one perspective drawing where you can see only one side of the drawing and there is only one ending point, I drew this using a pencil,it took one our.

 

The second drawing is a two perspective drawing where you can view the drawing from two sides and there are two ending points, this took me about an hour.

 

The third drawing is a three perspective drawing where you can view the drawing from three sides and there are three ending points this took me about an hour and half.

 

This type of drawing needs a huge focus on the measurements so you won’t miss a point.