.perimeter of an isosceles triangle is 30 cm. If it's equal side is12

1.	.perimeter of an isosceles triangle is 30 cm. If it's equal side is12 cm then third side will be:
Answer» $\huge\red{ \mid{ \underbrace{ \overline{ \tt 6 cm }} \mid}}$ Explanation: $\huge{\underbrace{\red{\mathscr{Perimeter=Sum ~ of ~ all ~ sides}}}}$ $\huge{\underbrace{\red{\mathscr{Let ~ the ~ third ~ side ~ be ~ x.}}}}$ $\huge{\underbrace{\red{\mathscr{1st ~ side+2nd ~ side+3rd ~ side=Perimeter}}}}$ $\huge{\underbrace{\red{\mathfrak{=>12+12+x=30}}}}$ $\huge{\underbrace{\red{\mathfrak{=>x=30-12-12}}}}$ $\huge{\underbrace{\red{\mathfrak{x=6}}}}$ $\huge{\underbrace{\red{\mathscr{The ~ 3rd ~ side ~ measures ~ 6.}}}}$