Avariable is at the level of measurement if it allows for the values of the variable to be arranged in a specific order and the difference between any two values is meaningful, but the ratio is not.

Given: jk ||lm prove: _2 = 27 statement justification 1. jk ||lm 1. given 2.26 = 27 3.22 = 26 2. 3. 4. _2 = 27 4. corresponding angles theorem transitive property of equality vertical angles theorem substitution property of equality