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To solve this problem, we need to calculate the total perimeter of the area Mr. Cooper wants to fence in. The diagram shows an L-shaped area with the following side lengths:

- 20 yards (top horizontal)
- 15 yards (right vertical)
- 12 yards (bottom horizontal)
- 7 yards (left vertical)

To get the total perimeter, we simply add up the lengths of the sides:

\[
\text{Perimeter} = 20 + 15 + 12 + 7 = 54 \text{ yards}
\]

Thus, the total amount of fencing Mr. Cooper needs is **54 yards**. 

The correct answer is **54 yds**.

Would you like more details or have any questions?

Here are five related questions to expand on this problem:

1. How do you calculate the perimeter of a rectangular area?
2. How would the answer change if the dimensions of the yard were doubled?
3. What if the yard was in the shape of a triangle—how would you calculate the perimeter?
4. How would you calculate the area of the fenced-in yard?
5. If fencing costs $10 per yard, what would be the total cost of fencing the yard?

**Tip:** Always double-check the shape and length of all sides when calculating perimeters, especially for irregular shapes.

Mr. Cooper plans to fence in his backyard. How many yards of fencing would he need? (Diagram provided: L-shaped yard with sides of 20, 15, 12, and 7 yards).

Learn how to calculate the perimeter of an L-shaped backyard using simple geometry. This step-by-step guide walks you through adding up side lengths of 20, 15, 12, and 7 yards, resulting in 54 yards of fencing required. Ideal for students in Grades 5-7.

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