Answer:
radius 12 units = 452.16 units²
diameter 16.8 units = 221.5584 units²
radius 3.4 units = 36.2984 units²
diameter 10 units = 78.5 units²
Formula for area of circle: 
A comparison of two quantities is called a ratio
Answer:
Step-by-step explanation:
10. mean, 15.5
median, 16.5
mode, 20