how do you find the approximate uncertainty of a circle of radius 3.8x10^4???? 1. The problem statement, all variables and given/known data how do you find the approx uncertainty for a circle with radius 3.8x10^4, i have no idea how to get the final uncertainty of the circle the radius uncertainty is 0.1x10^4 area of a circle is pie*r^2? so that means the area of the circle should be 4.5x10^9 isnt it??? 3. The attempt at a solution i figured that because there is only one variable that the uncertainty would just be 0.1x10^4, how do you work out the final uncertainty properly?????