A traffic signal board indicating 'DRIVE SLOWLY' ,is an equilateral triangle with side 'x' units.Find the area of the signal board,using Hero's formula.If it's perimeter is 180 cm,what will be the area of the signal board.
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a = 180/3= 60 cm
Now , area of signal board=√3a²/4
= √3/4 × 60 × 60
= 900√3 cm²
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