"Pi R Squared" refers to the formula for the area of a circle. A = (pi)r. 2. (3.1416 times the square of the radius)
http://wiki.answers.com/Q/What_is_pie_r_squared

The square root of pie is a constant never changing value of 1.7725. The square root of pie is another mathematical phenomenon proven and utilized for hundreds and thousands of years
http://www.ask.com/webanswers/Science/Mathematics...

Pie r squared is the formula for the area of a circle, but to calculate, I need
http://www.chacha.com/question/whatistheanswer...

π (pronounced pie, written as pi) is a constant. It's approximate value is 3.142, or 22/7. r is the radius of the circle. It is equal to half the diameter. πr² means pi
http://answers.yahoo.com/question/index?qid=200905...
