No. one fourth equals 0.25.
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Yes. Irrational numbers are found by getting the square root of a negative number.
It is impossible to have a surd that is not irrational. Surds are defined to be an irrational number (square root of a number).
An irrational number is one that cannot be expressed as a ratio of two integers.
No. A "rational" number is one that can be expressed as a "ratio" - a fraction. An IRRATIONAL number is one that cannot be expressed as a fraction.