What measuring tool and unit you would use to measure a rectangle explain

A ruler or tape measure would work. The units would depend, in part, on the size of the rectangle. English units of inches or feet would be the norm, unless you usd a meter stick. In that case, likely you would measure in centimeters or meters.

The answer for this is 9/1253decimal form 0.007

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.