Here are two circles. Their centers are A and F.

What is the length of segment AD?
__ cm
(Hint: the line from A to D is a radius and all of the radii have the same length)

On the first circle, what segment is a diameter?
__
(Hint: this would be TWO letters that go ALL THE WAY ACROSS the circle!)

How long is the diameter of both circles?

__ cm

(Hint: remember, the diameter is the line segment that goes all the way across the circle!)