Answer:
28.25 square units
Step-by-step explanation:
A circumference of the circle is

where r is the radius of the circle.
So,

The area of the circle is 

Substitute the value of the radius:
 
 
 
        
                    
             
        
        
        
Answer:
   54.5°
Step-by-step explanation:
You know that in a right triangle, the sine of an angle is given by ...
   Sin = Opposite/Hypotenuse
   sin(D) = EF/ED = 57/70
The inverse sine function is used to find the angle:
   ∠D = arcsin(57/70)
   ∠D ≈ 54.5°
 
        
             
        
        
        
Probability of having a girl: 1/2
Probability of having another girl right after: 1/2
Probability of having a boy right after: 1/2
Then another boy: 1/2
And a third boy: 1/2
To find compound probabilities, just multiply them together.
 
 
        
        
        
Answer:
The answer is D.
Step-by-step explanation:
All the numbers starting from 1 to infinity are known as natural numbers.  Answer D is not a number but all the other answers are.