find the third side of a triangle, sides are 8cm 11cm and semi perimeter is 16cm
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Semiperimeter, S=16 cm
Let the side of the triangle be a,b,c such that a= 8cm, b= 11cm
S = (a+b+c)/2
16 = (8+11+c)/2
16 = (19+ c ) / 2
32 = 19 + c
c = 32 - 19
c = 13
Therefore, third side of triangle is 13 cm
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