2 twentieths
In a multiplying fractions you just do numerator( top number) times the numerator of the other fraction. Then you do the same thing d for the denominator. So...
2/5x1/4 =2/20
and when simplified it's 1 over 15 or one fifteenths.
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No. The radius is half of the diameter.
512
If you're on a computer that allows you to ask this question and see the answer, it undoubtedly has a calculator program (in Windows, it's calc.exe). So you can answer this for yourself.
1 times 1 times 1225
355687428096000....Literrally there is a button on any good calculator for this it is shown as x! in this case 17! is the above number.