(a)Recall that the circumference of a circle is given by the following formula:

Where d is the diameter of the circle.
Substituting d=14 ft in the above formula, we get:

(b) Recall that the area of a circle is given by the following formula:

Substituting d=14 ft in the above formula, we get:

Answer:
(a)
Exact solution:

Approximation:

(b) Exact solution:

Approximation:
