Question

find the third side of a triangle, sides are 8cm 11cm and semi perimeter is 16cm​

Answer 1

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