The given circle has a diameter of d=4.2 m.
It is required to find the circumference and area of the circle.
Recall the formula for the circumference of a circle with diameter, d:

Substitute d=4.2 into the formula:

The radius of a circle is one-half of the diameter. It follows that:

Recall that the area of a circle with radius, r is given as:

Substitute r=2.1 into the formula:

The circumference is about 13.2 m.
The area is about 13.9 m².