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Is an irrational number a number that is represented by a nonrepeating decimal?
Yes, However, it is not defined that way. It is defined as a number that cannot be expressed precisely as a ratio of two real numbers (a fraction). But that is equivalent to a non-repeating decimal.
What is 1.333333333333333 defined as a decimal?
That already is a decimal.
Is the square root of 51 irrational?
yes, it is irrational. An irrational number can defined as a number that can not be expressed as a finite nor a repeating decimal.
Can a decimal number be a whole number?
No. A whole number is a number with no fractional (decimal) part. Therefore a decimal number can not be a whole number. Another view: 35.0 is a whole number AND a decimal. The fact that a number is a decimal does not automatically require it to have a fractional part. Even 35 is a decimal number (without a decimal point).
If the radius is 13 is the circumference 81.64?
The circumference is defined by 2* PI * radius Your calculation is therefore correct, but is depends upon what number of decimal places you need to quote your answer. The proper answer to two decimal places is 81.68.
