Astudent divided 10 meters of wire into 6 equal parts. which type of number describes the length of each part?
a. whole number
b. interger
c. rational number
d. irrational number

When 10 meters of something is divided into 6 equal parts,
then each part is (1,666 and 2/3) millimeters long.

A).  Whole number . . . No, that's not a whole number

B).  Interger . . . No, there's no such thing as an 'interger'.

C).  Rational number . . . Yes, its the ratio of  10,000 to  6 .

D).  Irrational number . . . No, it's not irrational.

article:What is Pi? - Live Science

"Pi r squared. In basic mathematics, pi is used to find the area and circumference of a circle. Pi is used to find area by multiplying the radius squared times pi. ... Because circles are naturally occurring in nature, and are often used in other mathematical equations, pi is all around us and is constantly being used"

edited

"circumference of a circle is 20 centimeters and you want to calculate the radius. Just plug the value for the circumference into the equation and solve. Remember that pi is approximately equal to 3.14."

source: https://www.livescience.com/29197-what-is-pi.html