Question

Find the circumference and the area of a circle with radius 3 cm.Use the value 3.14 for it, and do not round your answers.

Answer 1

First, to find the circumference, we can use the formula:

`C=2\pi r`

Where C is the circumference and r is the radius.

So, for r = 3, we have:

`\begin{gathered} C=2\cdot3.14\cdot3 \\ C=18.84\text{ cm} \end{gathered}`

Now, to calculate the area, we can use the formula:

`A=\pi r^2`

So we have:

`\begin{gathered} A=3.14\cdot3^2 \\ A=3.14\cdot9 \\ A=28.26\text{ cm}^2 \end{gathered}`