Thank you so much! may i ask how you got the 3units and 4units? can we just draw any diagram and use other units like 7,8? or we can’t because the qns gave l/4 units? :D

Good afternoon Sonia! I replaced every L/8 of the length with “1 unit” for easier reference at the end. Rather than using fractional numbers like L/8, L/4 or 3L/8, easier to our eyes are 1 unit, 2 units and 3 units.

So here, “3 units” actually refer to a length 3L/8, while “4 units” refer to a length L/2 with respect to the values of the lengths given.

Thanks so much Eric!!! :-)