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Find area elements


Here's a parameterization of a cylinder, for 0, is less than, theta, is less than, 2, pi:
v, with, vector, on top, left parenthesis, theta, comma, z, right parenthesis, equals, left parenthesis, r, cosine, left parenthesis, theta, right parenthesis, comma, r, sine, left parenthesis, theta, right parenthesis, comma, z, right parenthesis
What is the outward-pointing vector normal to the area element of this cylinder given r, equals, 5, theta, equals, start fraction, 3, pi, divided by, 2, end fraction, and z, equals, 1?
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