pi r square is the area of a circle.
http://wiki.answers.com/Q/What_is_Pie_R_Square

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...

The Square root of a Pie is approximately 1.7725 (the value often applied). (1.772453850905516027298167483314 even more precisely )
http://www.kgbanswers.com/whatisthesquareroot...
