Question

1. evaluate $\pi r^2$ when $r = 4.5$. use $3.14$ for $\pi$.

\bigcirc\\ 14.13
\bigcirc\\ 28.26
\bigcirc\\ 199.6569
\bigcirc\\ 63.585

Explanation:

Step1: Substitute the values

We know the formula is $\pi r^2$, and we are given that $\pi = 3.14$ and $r = 4.5$. So we substitute these values into the formula: $3.14\times(4.5)^2$.

Step2: Calculate $r^2$

First, calculate $4.5^2$. $4.5\times4.5 = 20.25$.

Step3: Multiply by $\pi$

Now multiply this result by $3.14$: $3.14\times20.25 = 63.585$.

Answer:

63.585 (corresponding to the option with 63.585)