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Can someone help me on these questions 
 
Find the area of an equilateral triangle with side length 11cm

Find the area of a square whose diagonal has length 12cm.

Find the perimeter of a square whose diagonal has length 6 cm

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Vo11eyba1117
The area of the triangle with 11cm equilator is 52.39cm^2
The area of the square with a diagonal line of 12cm length is 72cm^2
The perimeter of the square with a diagonal line of 6cm length is 4a