Answer:
10 units
Step-by-step explanation:
Because the center of the circle is at (9 , 9) and passes through (4 , 9), the radius must be 5.
Radius - The length from the center of a circle to its edge
Diameter - The length from one edge of a circle to the opposite edge
The diameter is double the length of the radius, meaning D = 2(5).
2 × 5 = 10
So, the diameter of the circle is 10 units.
