Sagot :
[tex]\large\bold\color{cyan}{Answer:}[/tex]
21 cm
[tex]55 - (17 \times 2) = 21[/tex]
[tex]═ ═ ═ ═ ═ ═ ═ ═ ═ ═ ═ ═ ═ ═ ═ ═ ═ ═ ═ ═ ═[/tex]
#[tex]\large\sf\color{cyan}{CarryOnLearning}[/tex]
[tex]\huge\bold\color{cyan}{\boxed{Xui}}[/tex]
Length of equal sides = 18cm
Let the length of the third side =x cm
Perimeter = sum of all sides
∴50=18+18+x
50=36+x
x=50−36
=14cm
Thus, the length of the third side is 14 cm