What Value is added to each of the quadratic expression below to make it a perfect square A. x2 + 12x + ___

B. k2 + __k + 100

C. z2 - 10z + 12 +

Circle a has a diameter of 7 inches, a circumference of 21.98 inches, and an area of 38.465 square inches. the diameter of circle b is 6 inches, the circumference is 18.84 inches, and the area is 28.26 square inches. part a: using the formula for circumference, solve for the value of pi for each circle. (4 points) part b: use the formula for area and solve for the value of pi for each circle. (4 points)