What is the perimeter of a triangle with sides measuring 3 cm, 4 cm, and 5 cm?

To find the perimeter of a triangle, you add up the lengths of all its sides. In this case, the sides measure 3 cm, 4 cm, and 5 cm. By calculating:

3 cm + 4 cm + 5 cm = 12 cm.

Thus, the perimeter of the triangle is 12 cm. This confirms that the correct answer corresponds to the total sum of the sides, which demonstrates a fundamental understanding of how to calculate the perimeter in geometric figures.

The other provided options do not accurately combine the side lengths as required for determining the perimeter. They fall short of representing the correct total of the three sides mentioned.