size of powerpoint slides in UK vs US?

I am US-based and am working on a slideshow for use in the UK.

In the US, slides default to size of 10 inches by 7.5 inches. What is the size of a ppt slide in the UK? I can't find it defined anywhere. Thank you!

Assuming you have chosen "On-screen Show" as the page size, all is good.

Whilst different countries may chose "A4" or "Letter" for printing, we all use the same screens!! Sure some may use widescreen Monitors or Projectors, but safe to say nearly all are standard 4x3 ratio.

Kyle