Question

Geometry help please!!

Answer 1

The first one, 18cm, 6cm, 13cm. First, we need to learn about the triangle equality, it is A + B > C.

 So if we take 6+18 it would be 24 which is greater than 13.  

Also we have to try 6+13 it would be 19, which is greater than 18.

Then we also have to try 18+13, which is 31.  And it is greater than 6.

When it does not fail the triangle equality, it can be a triangle.  

Answer 2

I think it is the three one