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Area of triangle = 1/2 * breadth * height
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I) 1/2*base*height  (applicable for all)
ii) sq rt(3) / 4 * a^2  where a is the side (applicable for equilateral triangle)
iii) sq rt (s(s-a)(s-b)(s-c))  where s is the semi perimeter or (a+b+c)/2   and                                          a, b, c are the three sides  (applicable for scalene triangles)
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