Question

Find the third side of A whose two sides are 10cm and 15 cm and semi perimeter is 19cm?​

Answer 1

Answer:

Semiperimeter, S=18 cm

Let the side of the triangle be a,b,c such that 

a=16 cm, b=14 cm

S=2a+b+c=216+14+c18=230+cc=36−30=6 cm

Therefore, third side of triangle is 6 cm

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Answer 2

Answer:

$2 \times 19 = 38 \\ 15 + 10 + x = 38 \\ 25 + x = 38 \\ x = 38 - 25 \\ x = 13$