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1. supplementary angles

2. acd and bcd

step-by-step explanation:

i would think "anyone would want the best for their child" is correct

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

yes i do see that. i say this because i am doing my very best in high school so i can get a scholarship and credits.