Its county seat is San Antonio, the second-most populous city in Texas and the seventh-largest city in the United States. Bexar County is included in the San Antonio-New Braunfels, TX metropolitan statistical area. Bexar county includes Government Canyon state natural area in northwestern part of the county.
If the screen width is 7 feet and the projector's throw ratio is 2.0 - 2.4:1 (because projectors have zoom lenses, they also have a range of throw ratios) then you can place your projector anywhere from 14 to 16.8 feet away from the screen.
I can find out about projection distance, angle and keystone correction however i am a bit unsure of the maximum distance I can run a vga cable before we start to loose image quality. The projector will get its signal from a HP laptop. Currently we need to run the cables 25 metres. Thanks,