Question

find a when r = 3. a = πr² (area of a circle) a ≈ (type an integer or decimal rounded to the nearest hundredth as needed)

Explanation:

Step1: Substitute r value

Substitute $r = 3$ into $A=\pi r^{2}$. So $A=\pi\times3^{2}$.

Step2: Calculate the result

$3^{2}=9$, then $A = 9\pi$. Using $\pi\approx3.14159$, $A\approx9\times3.14159 = 28.27431$. Rounding to the nearest hundred - th, $A\approx28.27$.

Answer:

$28.27$