CAN WE PLACE SET SQUARE ANYWHERE ON LINE AB?

Hi Anubhuti! 
 
To draw a perpendicular to a line AB through a pint L on AB using set square and roller (as shown in second video), you need to place setsquare at L only.
 
To draw a perpendicular to a line AB through a pint C not on AB using set square and roller (as shown in fourth video), you need to place the setsquare anywhere on line AB.
 
Cheers!

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