In the figure shown, PQRSTU is a regular polygon with sides of length x. What is the perimeter of triangle PRT in terms of x ?
~$x\sqrt{3} \over 2$~
x~$\sqrt{3}$~
~$3x\sqrt{3}\over 2$~
3x~$\sqrt{3}$~
4x~$\sqrt{3}$~
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边长是根号三x吧
边长是根号三x吧
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