brainliest* find the diameter of the circles (show work of all three)

Answer:
4. 30 ft
5. 4m
6. 32 mm
Step-by-step explanation:
Diameter = 2(radius)
Since they give the radius in all of them, you multiply the radius by 2 for all.
4. 15 * 2 = 30 ft
5. 2 * 2 = 4 m
6. 16 * 2 = 32 mm