math
posted by Daniel .
Suppose a white dwarf star has a diameter of approximately 1.6692x10^4 km. Us the formula 4pie^2 to find the approximate surface area of the star

surface area= 4 PI * (diameter/2)^2
where did you get your formula? 
This is what it said in the book.
use the formaula
pie = 3.14
4pie r ^2