Find the missing side lengths. Leave your answers as radicals in simplest form. *

That's the isosceles right triangle, one of the two cliche triangles students are expected to learn.  The sides of the 45°/45°/90° triangle are in the ratio 1:1:√2.

So v= 3√2  (the two legs are equal) and hypotenuse u = √2 × v = 6.

C

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the answer is c: divide the arc's degree measure by 360°, then multiply by the circumference of the circle.