We introduced ourselves to sir and the rest of the class and everyone also mentioned why they took technical drawing as their elective. My reason to take technical drawing was that I had done TD before in my 11th and 12th and I loved it so I wanted go deeper into the subject.

Sir called up a student and told him to draw a phone on the board, after drawing the phone sir asked us which phone it was and which model, it was supposed to look like an Iphone 7 plus but some details were missing, related to this phone sir taught us the different types of life used in TD.

• Object Line: To indicate all visible outline/boundary of an object.
• Hidden Line: To represent hidden edges of an object.
• Centre Line: To show a line passing through centre of hole, pitch, line etc.
• Extension line, Dimension Line and Leaders: To show dimension of an object.
• Section Line: To indicate cut portion of an object.
• Cutting plane line and ISO cutting plane line: To show imaginary cutting of an object.
• Break Line: To show break of an object in order to shorten the view of a long part.
• Phantom/Repeat Line: To show alternate position of an object or the position of an adjacent part.

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