Circle a has a diameter of 9 inches, a circumference of 28.26 inches, and an area of 63.585 square inches. the diameter of circle b is 5 inches, the circumference is 15.70 inches, and the area is 19.625 square inches.

part a: using the formula for circumference, solve for the value of pi for each circle.

part b: use the formula for area and solve for the value of pi for each circle.

part c: what observation can you make about the value of pi for circles a and b?

answer: option a.

step-by-step explanation:

you know that the quadrilateral opqr ( a four sided figure) is inscribed in circle. this means that all its vertices are on the circle.

then, by definition, the opposite angles of the quadrilateral are supplementary, this means that the sum of their measures is 180 degrees.

you can observe in the figure that the angles ∠opq   and the angle ∠orq   are opposite, therefore:

then, can be used to d to calculate the measure of ∠opq