In the given triangle ABC, draw the straight lines through the vertices A, B and C parallel to BC, CA and AB respectively. Prove that the sum of internal angles of the triangle ABC is 180° for each of the parallel lines drawn as above

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)