I don't take offence, if you could express the tone I used in typing something as when saying something it would not come across that way.
I certainly don't think the question is "Lame"
I had an awkward area in a bathroom that I could not get into. Not close enough to read the size of cuts required.
Raja gave me the solution first reply, popped into a DIY store picked up a combination square, removed and reversed the adjustable square. Ruler into wall/object and slide square up to last fixed tile and tighten the thumbscrew pull it out and read the ruler minus 2mm grout line and job done perfect measure.
Sorry if it sounded lame but I'm a bit of a perfectionist rather than siliconist
