Question

The perimeter of a triangle of sides 12cm and 5 cm is 30cm. Find its third side​

Answer 1

Answer:

perimeter of triangle: A + b + c

12 + 5 + c: 30

17 + c: 30

c: 30-17

c: 13

third angle is 13 cm

Answer 2

Answer:

Let the unknown number be x.

So it would be like this:

12+5+x=> 30

17+x=> 30

x=> 30–17

x=>13

Thus the third side is 13 .

If you want to check so you can add this three sides of triangle.

So ,12+5+13=>30

So after adding we get 30 thus 13 is the correct answer.