If two lines are perpendicular, what is the measure of the vertical angles?
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A rational number is a number that can be written as a fraction or "ratio".
It includes the set of integers because all of them have a denominator of 1. A rational number can take on the form of
where b ≠ 0. Terminating and repeating decimals are rational numbers because they too can be written as a ratio; for example, 0.3 = 
or 0.3333... = 
.
It includes the set of integers because all of them have a denominator of 1. A rational number can take on the form of
