Two sides of a triangle are 24.8cm and 15.6cm if the perimeter of the triangle is 52.9cm find it's third side
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a+b+c = perimeter
24.8 + 15.6 + c = 52.9cm
40.4+c = 52.9cm
c=52.9 - 40.4cm
c=12.5
your answer is 12.5
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