To find the output of the function when the input is 7 (the radius \( r \)), we will substitute \( r = 7 \) into the area formula for a circle, which is given by:
\[ A = \pi r^2 \]
- Substitute \( r = 7 \):
\[ A = \pi (7)^2 \]
- Calculate \( (7)^2 \):
\[ (7)^2 = 49 \]
- Substitute back into the area formula:
\[ A = \pi \times 49 \]
- Therefore:
\[ A = 49\pi \]
This means that the output of the function when the input radius is 7 is:
\[ A = 49\pi \]
If you want a numerical approximation, using approximately \( \pi \approx 3.14 \):
\[ A \approx 49 \times 3.14 \approx 153.86 \]
So the output can also be expressed as:
\[ A \approx 153.86 \]
Thus, the area of the circle with a radius of 7 is \( 49\pi \) or approximately 153.86.