Area of a circle is πr^2. 
The radius of the smaller circle with diameter 10 cm is 5 cm.
The radius of the larger circle with diameter 20 cm.is 10 cm.
Area of larger circle : Area of smaller circle
Area of larger circle = 100π.
Area of smaller circle = 25π.
Ratio = 100π : 25π or 100π/25π.
        
             
        
        
        
Answer:
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
13 per minute
Step-by-step explanation:
 
        
             
        
        
        
It’s already in ascending order.
3/5= .6
5/8= .625
5/6= .833
7/4= 1.75