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Python: calculating the area of triangle

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import math
print "Enter the three sides of triangle"
s1 = float(raw_input("Side 1: "))
s2 = float(raw_input("Side 2: "))
s3 = float(raw_input("Side 3: "))
s = (s1 + s2 + s3) / 2
print "Area of the triangle:", math.sqrt(s * (s - s1) * (s - s2) * (s - s3))

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