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lebar = 84 / (3√3 + √6) .....kalikan (3√3 - √6)/(3√3 - √6)
lebar = 84 (3√3 - √6) / (3√3 + √6)(3√3 - √6)
lebar = 84 (3√3 - √6)/ (27 -6) = 84 (3√3 - √6)/(21)
lebar = 4 (3√3- √6)