Question

module assessment review
a spinning disc has a diameter of 22 centimeters.
what is the area of the disc, rounded to the hundredths place, in square centimeter
(only type in the decimal answer, no words or symbols)

Explanation:

Step1: Find the radius

The radius $r$ of a circle is half of the diameter $d$. Given $d = 22$ cm, so $r=\frac{d}{2}=\frac{22}{2}=11$ cm.

Step2: Calculate the area

The area formula of a circle is $A=\pi r^{2}$. Substitute $r = 11$ into the formula, we get $A=\pi\times(11)^{2}=121\pi$ $cm^{2}$.

Step3: Round the result

Using $\pi\approx3.14159$, $A = 121\times3.14159=379.94239\approx379.94$ $cm^{2}$.

Answer:

379.94