The problem asks you to draw phasor diagrams of the specified voltages and currents using the indicated scales. Of course, you have to calculate each the voltages and currents first.
"in" is an abbreviation for Inches. 12 inches = 1 foot. It is part an archaic system of measurement used commercially in the US and elsewhere. One inch = 2.54 centimeters . Why not use any scale that is convenient and easy to read?
Which could mean that you do not know how to draw a phasor diagram.
Also, your profile shows you as being in the USA.
I guess that most people in the USA would know that "in" was an abbreviation of "inch".
As a moderator, I can see your IP address which put you in Europe.
Non-Brits would likely not know what "in" is.