Question

two sides of a triangle are 18 cm and 13 cm the perimeter of triangle is 42 cm find its third side

Answer 1

Two sides of a triangle are 18 cm and 13 cm and given perimeter of triangle is 42 cm then for the 3rd side
42=18+13+3rd side
3rd side=42-31=11
Show the measure of third side is 11 cm

Answer 2

heya frnd,
here is your answer,

given,
a triangle's one side = 18cm
second side = 13cm
perimeter = 42cm

to find,
the third side of the triangle

formula to be used,
perimeter of ∆ = 1st side + 2nd side + 3rd side

solution,
let the 3rd side = x cm

perimeter = 1st side + 2nd side + 3rd side

=> 42 = 18 + 13 +x

=> x + 31 = 42

=> x = 42-31
= 11 cm


Hence the third side of the triangle is 11 cm.




Hope this helps

if u have any doubt u can ask me frankly, i will try to help.


thank you


#Sneha