## Answer :

The formula for the area [tex]\( A \)[/tex] of a circle is given by:

[tex]\[ A = \pi r^2 \][/tex]

In this formula:

- [tex]\( \pi \)[/tex] (pi) is a constant, approximately equal to 3.14159.

- [tex]\( r \)[/tex] represents the radius of the circle.

- [tex]\( r^2 \)[/tex] denotes the square of the radius.

From the formula, it is clear that [tex]\( r^2 \)[/tex] is the quantity that is multiplied by pi [tex]$(\pi)$[/tex]. This means among the options given, the correct one is:

B. [tex]\( r^2 \)[/tex]