Ryan wants to put a fence around a rectangular dog run with a length of 20 meters and width of 12 meters. How many maters of fence does Ryan need?

Perimeter = 2L + 2W

P = 2(20) + 2(12)
P = 40 + 24
P = ?

40 + 24 = 64

To find out how many meters of fence Ryan needs, we need to calculate the perimeter of the dog run.

The perimeter of a rectangle is found by adding up the lengths of all the sides. In this case, the dog run has two lengths of 20 meters and two widths of 12 meters.

To calculate the perimeter, we add the lengths of all the sides:
Perimeter = 20 + 20 + 12 + 12

Simplifying it, we get:
Perimeter = 40 + 24

Perimeter = 64 meters

So, Ryan needs 64 meters of fence to enclose the dog run.