To find the actual area of the park based on the information given, we’ll go through the following steps:

1. Identify the dimensions on the map:

   • Length: 4 inches
   • Width: 6 inches

2. Determine the scale:

   • The scale is 1 inch = 20 miles, which means each inch on the map represents 20 miles in real life.

3. Calculate the actual dimensions of the park:

   • Actual length = $4 \text{ inches} \times 20 \text{ miles per inch} = 80 \text{ miles}$
   • Actual width = $6 \text{ inches} \times 20 \text{ miles per inch} = 120 \text{ miles}$

4. Calculate the actual area:

   • Area = Length × Width
   • Area = $80 \text{ miles} \times 120 \text{ miles} = 9600 \text{ square miles}$

So, the actual area of the park is 9600 square miles.

Would you like more details or have any questions about this solution?

Here are some related questions to explore further:

1. How would the area change if the scale was 1 inch = 10 miles?
2. If the map dimensions doubled, what would be the new actual area?
3. How would you calculate the area if only the map area and scale were given without specific dimensions?
4. What is the importance of understanding scale in map reading and real-life applications?
5. Can this method be applied to irregular shapes, and if so, how?

Tip: Always verify the scale when interpreting maps to ensure accuracy in real-world measurements.