The radius is 7 what it is telling you is that you already did the square 4^2*3.14=49 pi. 
        
             
        
        
        
Answer:
We have the measures:
1023 cm
2.3 m
8.72m
6430 mm
1200 mm
6.4 cm
2.5m
0.06km
Now let's write all those measures in the same unit, let's use meters.
We know that:
1cm = 0.01m
1mm = 0.001m
1 km = 1000m
Then, we can rewrie the measures as:
1023 cm = 1023*0.01 m = 10.23 m
2.3 m
8.72m 
6430 mm = 6430*0.001 m = 6.430 m
1200mm = 1200*0.001 m = 1.2 m
6.4 cm = 6.4*0.01m =  0.064 m
2.5m 
0.06km = 0.06*1000km = 60m
Then the order, from smallest to largest is:
6.4 cm
1200mm 
2.3 m
2.5m 
6430 mm
8.72m 
1023 cm
0.06km
 
        
             
        
        
        
Answer:
24
Step-by-step explanation: