If the circle below has center $O$ and the length of the arc $RST$ is $18 \pi,$ what is the perimeter of the regio

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Vincen: Legendary Member; Posts: 2898; Joined: Thu Sep 07, 2017 2:49 pmFollowed by: 5 members; Thanked: 6 times

by Vincen » Wed Oct 06, 2021 5:36 am

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If the circle below has center $O$ and the length of the arc $RST$ is $18 \pi,$ what is the perimeter of the region $RSTU?$

(A) $12 \pi+ 18$
(B) $12 \pi+ 27$
(C) $18 \pi+ 27$
(D) $18 \pi+ 54$
(E) $18 \pi+ 108$

Answer: D

Source: Manhattan GMAT

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Source: Beat The GMAT — Problem Solving | Wed Oct 06, 2021 5:36 am

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