If a fraction has the denominator, it is undefined.

step-by-step explanation:

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the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8

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arc length = radius * x ( in radians)

6 * pi = 18 * x

divide by 18 on each side

6 pi / 18 = x

pi/3 = x

the angle is pi / 3 radians

or   60 degrees