Part a. expand the polynomial (x2 − y2)2 + (2xy)2, then simplify it by combining like terms. part b. factor the result and write it as a square. part c. now combine the results of part a and part b, and identify the resulting identity.

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)