The length of each side of an equilateral triangle having an area of $9 \sqrt{3}cm^2$ is
A
8 cm
B
36 cm
C
4 cm
D
6 cm
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D
6 cm
D
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In a scalene triangle, one side exceeds the other two sides by 4 cm and 5 cm respectively and the perimeter of the triangle is 36 cm . The aren of triangle is