What is the area of a circle with a radius of 5 units?

Calculation:

To find the area of a circle, we use the formula \( A = \pi r^2 \), where \( r \) is the radius. In this case, the radius \( r = 5 \) units.

Step-by-step solution:

1. Step 1: Substitute the radius into the area formula:
   \( A = \pi (5)^2 \)
2. Step 2: Calculate the square of the radius:
   \( 5^2 = 25 \)
3. Step 3: Multiply by \( \pi \) to get the area:
   \( A = 25\pi \) square units.

Answer: The area of the circle is \( 25\pi \) square units.