Please help: Tanya has a garden with a trench around it. The garden is a rectangle with length 2 1/2m and width 2m. The trench and garden together make a rectangle with length 3 1/2m and 3m width. Find the area of just the trench. Please help

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)