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part 1 answer = 8

part 2 answer = 72

step-by-step explanation:

part 1 explanation = add all of the numbers, then divide by how many numbers you have. so, 200/25 = 8.

part 2 explanation = not gonna lie, this is hard to explain, so just google how to do it.

point a is the center of the circle that passes through points e, f, and g and the center of the circle that passes through points x, y, and z.

i hope this is what you were looking for.

see attached graph