A circle has a diameter of 4 meters.

What is its perimeter (to the nearest hundredth) ?

When the shape is a circle, its perimeter is called the

"circumference" of the circle.

The circumference of a circle is always (pi) times its

diameter.

(pi) is roughly 3.1416. So if the diameter is 4 meters,

then the circumference is

12.5664 ... meters.

Rounded to the nearest hundredth, that's 12.57 meters.