If its perimeter of an equilateral triangle is 180 cm , what be its area.
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Step-by-step explanation:
sum of 3 sides = 180° {By angle sum property}
Let a be the each side of triangle
a+a+a= 180
=>3a=180=>a= 60 cm
therefore area=1/2×base× height
=>1/2× 60×60=1800cm²
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