Question

the perimeter of a triangle is 40 cm . two of its sides measures 12.9 and 14.6cm find the lenth of its third side​

Answer 1

Answer:

12.5cm

Step-by-step explanation:

let the third side be x

then

x+12.9+14.6=40

x+27.5=40

x=40-27.5=12.5cm

Answer 2

lenth of its third side​ $=12.5cm$

see the pic that i have attached

hope this helps...