Two sides of a triangle or 10 MM and seven MM determine the length of the third side from the choices given

5MM
20mm
2mm
1mm

To determine the length of the third side of the triangle, we can use the triangle inequality theorem, which states that 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, the two sides of the triangle are 10mm and 7mm.

So, the possible range for the length of the third side would be:
10mm + 7mm > Third side
17mm > Third side

Therefore, the length of the third side can be either 5mm or 20mm.

From the given choices, the possible length of the third side would be:
5mm (10mm + 7mm = 17mm, which is greater than 5mm)
20mm (10mm + 7mm = 17mm, which is less than 20mm)

So, the length of the third side can be either 5mm or 20mm.