Lots of good responses but it can get confusing. Here are answers to your specific questions.
Diameter of rear wheel like you asked: Measure axle to ground to get the radius. The distance traveled in one revolution is 2x3.14xradius (so 20 inches axle to ground is 2x3.14x20 or 125.6 inches traveled in one revolution). Then feet per minute speed will be distance (feet) divided by time (minutes). If you want miles per hour multiply by 88.
Distance to get 1/10 acre is 4,356 divided by the width. So if you spray 33 ft wide it takes 132 feet to cover 1/10 acre.
Now my advice, use a 100 ft tape and measure like JD said, 300 ft and set stakes. Then fill your tank to a good mark, on level ground. Then go to the field and spray your 300 ft line, starting at the first stake and finishing at the last stake. Go back to the house and park in the same spot you filled and refill to your mark with marked gallon jugs and measuring cups so you know exactly how much you sprayed in 300 ft. Acreage is width sprayed times 300 (length) divided by 43,560.
Of course you could do 1/10 acre but 2/10 will be more accurate.
One thing which hasn't been mentioned is dilution. If you are spraying too much per acre you can dilute you mixture to get what you want. For instance, you want to spray 18 GPA but the tractor gear you want to use is spraying 20 GPA. You just need to add 2 GPA of water mixed in before you start. If you are putting 250 gallons in a 300 gallon tank you wanted to spray 13.88 acres with the tank (250/18) but instead you will only get 12-1/2 acres (250/20). So to get 18 GPA you need to add 27.76 gallons of water (13.88 acres times 2 GPA) to the mix. Now you will spray 277.76 gallons over (275/20) over 13.88 acres. So the original 250 gallons of mix will spray over 13.88 acres (250/13.88=18 GPA). In reality you are never this accurate but if you shoot for accurate numbers you get closer.
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