Question

1 look at the circle below. it has a diameter of 20 cm. diameter = ____ radius = ____ a = \\(\pi r^{2}\\) a = \\(\pi\cdot r\cdot r\\) a =

Explanation:

Step1: Recall diameter - radius relation

The radius $r$ of a circle is half of its diameter $d$. Given $d = 20$ cm, so $r=\frac{d}{2}$.

Step2: Calculate the radius

$r=\frac{20}{2}=10$ cm.

Step3: Calculate the area using the formula

The area formula of a circle is $A = \pi r^{2}$. Substitute $r = 10$ cm and $\pi=3.14$ into the formula. So $A=3.14\times10\times10$.

Step4: Compute the area value

$A = 314$ $cm^{2}$

Answer:

Diameter = 20 cm
Radius = 10 cm
$A = 314$ $cm^{2}$