The answer for the first question would be 3952+3952 =7903
        
                    
             
        
        
        
Answer:
18 
Step-by-step explanation:
90% of 20 is 18
 
        
                    
             
        
        
        
The general equation for computing the circumference of a circle is 

, where C is the circumference, and d is the diameter. (You might also see the equation as 

 where r is the radius, because 

)
Computing the circumferences of the two circles, we get:


.
To calculate the ratio of two numbers, we can divide one by the other. You can look at this as "How many times does the denominator fit in the numerator?"

So the circumference of the complex impact crater is 2 times greater than the circumference of the simple impact crater.
 
        
        
        
A line of symmetry would separate a shape to make multiple shapes that are exactly the same.
The answer is C.2
 
        
             
        
        
        
Answer:
ill try working on it
Step-by-step explanation: