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$18$$\newline$What is the circumference of the circle?$\newline$Use $3$.$14$ for $\pi$.$\newline$SHOW YOUR WORK. ($1$)$\newline$$c=\pi r$$\newline$ANSWER:$\newline$$20$$\newline$($2$)$\newline$Angle $A$ and Angle $B$ are vertical angles.$\newline$$m \angle A=8 x+2$ and $m \angle B=10 x-8$$\newline$ind the value of $x$ and the measure of Angle $A$.