P divided by 2 written as an algebraic expression

p/2

Step-by-step explanation:

Written as a fraction, p/2 is the same as p divided by 2.

17 cm

Step-by-step explanation:

To find the perimeter of any figure, you must add all the side lengths. In a triangle, there are three side lengths to add, and in this case, they are 3 cm, 6 cm, and 8 cm long. So:

3 + 6 + 8 = 17 cm

∴, the triangle's perimeter is 17 cm.