In a 30 60 90 triangle, the short side = one half the hypotenuse = 4.5 The middle side = short side * sq root of 3 So, the middle side = 4.5 * sq root of 3 (
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7.7942</span></span></span>) Perimeter = 4.5 + 7.7942 + 9 Perimeter =
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21.2942
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