If the lengths of two sides of an isosceles triangle are 10 and 4, respectively, what must be the length of the third side of the triangle? how do you know if it's 10 or if it's 4?

Hey there!

This is a little confusing. But it’s 10. If there’s 2 sides with the length of 4 and one with 10, then it’s not a closed triangle. With two sides lengths of 10 and one with 4, the triangle is able to be closed.

I hope this helps!