Question

two side of a triangle are 18cm and 13cm the perimeter of the triangle is 42cm find it's thirde side​

Answer 1

Answer:

11cm

Step-by-step explanation:

Perimeter of triangle=sum of all sides

Let the third side be x

Perimeter= 18 + 13 + x

42= 31+x

42-31=x

x=11 cm

Answer 2

Answer:

side1=18cm

side2=13cm

peremetre of triangle=42cm

side1+side2+side3=42

18+13+side3=42

31+side3=42

side3=11cm

verification:-

11+13+14=42cm