SAT Question 6ae1360d: Area and Volume answer and explanation with Desmos solution

41$.Thearea,$A$,ofacircleisgivenbytheformula$A = \pi r^{2}$,where$r$istheradiusofthecircle.I{t}^{\prime }sgiventhattheareaofthecircleis$b \pi$squareinches,where$b$isaconstant,andtheradiusofthecircleis＄2.1$ inches. Substituting $b\pi$ for $A$ and $2.1$ for $r$ in the formula $A=\pi r^2$ yields $b\pi =\pi \left(2.1^2\right)$. Dividing both sides of this equation by $\pi$ yields $b=4.41$. Therefore, the value of $b$ is $4.41$. Note that 4.41 and 4.410 are examples of ways to enter a correct answer.