Please show step by step on how to solve the following problem. thanks!

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9. (a) Use Stoke's Theorem to evaluate f0 13 - dF, if ) F = (ivy, yz, zit); C is the triangle in the plane a: + y + z = 1 with vertices (1,0,0), (0,1,0), and (0,0,1) with a counterclockwise orientation looking down the positive from the rst quadrant toward the origin. (a) Make a sketch of the curve C and a surface that it encloses (any surface, really, however simple ones are preferred)