#3
The rule of the circumference of the circle is
[tex]C=\pi d[/tex]
d is the diameter of the circle
From the given picture we can see
A circle with a diameter of 20 cm, then
[tex]d=20[/tex]
Substitute d in the rule by 20
Use pi = 3.14
[tex]\begin{gathered} C=3.14\times20 \\ C=62.8\text{ cm} \end{gathered}[/tex]
The circumference of the circle is 62.8 cm
