Question

Concentric circles are drawn in the coordinate plane. A diameter is drawn in the small circle and in the large circle, and the endpoints of the two diameters are at A(5, 8), B(9, 8), T(6, 8), and U(8, 8). Determine the length of the diameter of the largest circle and the center of the circles.

A.

width = 2 units, center = (1, 0)
B.

width = 2 units, center = (7, 8)
C.

width = 4 units, center = (7, 8)
D.

width = 8 units, center = (1, 0)

Answer 1

This is really only about the large circle.

The centre point is the midpoint of the diameter

the diameter points are as shown:



find the midpoint of the larger circle from the ends of the diameter

Answer 2

answer?

Answer 3

Well 2 months later....
The answer is found by putting the X values onto the ppoints (the Y values are all 8)

Then find the diameter by subtracting the smallest from the largest

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