Find the circumference and area of a circle with a diameter of 22 inches. leave your answers in terms of pi. a. c = 11π; a = 44π. b. c = 22π; a = 44π. c. c = 11π; a = 121π. d. c = 22π; a = 121π

The area (A) and circumference (C) of a circle may be calculated by the equations,
                          A = πD² / 4     ;           C = πD
Substituting the known diameter gives,
                         A = π(22 in)² / 4           C = π(22)
Simplifying gives an answer of,
                        A = 121 π in²                 C = 22π in
Therefore, the answer is letter D.