A smooth vector field G has curl G(0, 0, 0) = 3i - 2j + 9k. Estimate the circulation around a circle of radius 0.01 centered at the origin in each of the following planes.
(a) xy-plane, oriented counterclockwise when viewed from the positive z-axis
(b) yz-plane, oriented counterclockwise when viewed from the positive x-axis
(c) xz-plane, oriented counterclockwise when viewed from the positive y-axis