Can a triangle be formed with the side lenghts of 8cm, 4cm, and 12cm

No, because the sum of the measures shorter legnths of the sides must be greater than the measure of the greatest angle

4+8=12
so therefor the side legnths if you tried to make into a triangle, it would make a line 12 units long

no is the answer

No, a triangle cannot be formed with side lengths of 8 cm, 4 cm, and 12 cm.  This is because of the triangle inequality which states that the sum of any two of the side lengths of a triangle must be greater than the length of the third side.

This means that 8 + 4 must be greater than 12, however, it is not, it is equal to 12.

Therefore, no a triangle can NOT be formed with the side lengths of 8 cm, 4 cm, and 12 cm.