Find the perimeter of a triangle with sides equal to 13 cm, 12 cm and 5 cm.

The correct answer is 30 cm.

Step-by-Step Explanation:

1. Understand the definition of the perimeter of a triangle: The perimeter of any polygon, including a triangle, is the total distance around its boundary. It is calculated by adding the lengths of all its sides together.

2. Identify the given side lengths of the triangle from the question:
Side 1 ($a$) = 13 cm
Side 2 ($b$) = 12 cm
Side 3 ($c$) = 5 cm

3. Write down the formula for the perimeter ($P$) of a triangle:
$P=a+b+c$

4. Substitute the given side lengths into the formula:
$P=13+12+5$

5. Perform the addition:
$13+12=25$
$25+5=30$

Therefore, the perimeter of the triangle is 30 cm.