two boards make up two sides of triangular sandbox 8ft and 5 ft what size board makes third side? I say 5 because this makes an isoles triangle

As far as I know the third side could be anything between 3 feet and 13 feet.

8-5 to 8+5

You need to know more about the triangle.

To determine the length of the third side of the triangular sandbox, we can use the triangle inequality theorem. According to this theorem, the sum of the lengths of any two sides of a triangle must be greater than the length of the third side.

In this case, we have two boards with lengths of 8ft and 5ft. Let's consider the board with a length of 8ft. According to the triangle inequality theorem, its length plus the length of the third side must be greater than the length of the other board (5ft).

So, we can set up the inequality: 8ft + Third side > 5ft.

Simplifying this, we get: Third side > 5ft - 8ft.

Further simplification gives us: Third side > -3ft.

Since lengths cannot be negative, this means that any positive value for the third side will satisfy the inequality. Hence, the third side can be any length greater than 0ft.

Therefore, your explanation that the third side could be 5ft is correct. However, it's important to note that the third side can be any value larger than 0ft.