Question

what is the area of the circle? use 3.14 for $pi$ and round to the nearest whole number.
a $201\\ \text{cm}^2$
b $13\\ \text{cm}^2$
c $39\\ \text{cm}^2$
d $50\\ \text{cm}^2$

Explanation:

Step1: Recall circle area formula

The area of a circle is given by $A = \pi r^2$, where $r$ is the radius.

Step2: Substitute given values

Here, $r = 4$ cm, $\pi = 3.14$. Substitute into the formula:
$A = 3.14 \times 4^2$

Step3: Calculate the radius squared

$4^2 = 16$, so:
$A = 3.14 \times 16$

Step4: Compute the product

$3.14 \times 16 = 50.24$

Step5: Round to nearest whole number

$50.24$ rounded to the nearest whole number is 50.

Answer:

D. $50\ \text{cm}^2$