Final answer:
The perimeter of the triangle cannot be determined without knowing the length of the third side. Based on the given side lengths, the triangle is a right triangle.
Step-by-step explanation:
To find the perimeter of a triangle, you need to add up the lengths of all three sides. In this case, the two legs of the triangle measure 3 cm and 4 cm respectively. The formula for the perimeter of a triangle is P = a + b + c, where a, b, and c are the lengths of the sides. So, the perimeter of this triangle is 3 cm + 4 cm + c. However, since we don't know the length of the third side, we can't find the exact perimeter at this time.
Based on the given side lengths, we can determine the type of triangle formed. In this case, the triangle is a right triangle since it has a leg measuring 3 cm and a leg measuring 4 cm. The third side, which we don't know the length of, would be the hypotenuse.