The area of a circle is the size of the 2-dimensional space inside the circle's 
closed curved boundary.
The area can be calculated in terms of known linear measurements of the circle:
-- Area  =  (π) x (radius)²
-- Area  =  (π/4) x (diameter)²
-- Area  =  (1/2) x (circumference) x (radius)
-- Area  =  (1/4) x (circumference) x (diameter)
Any of these formulas will give you the area.  The one you decide to use 
just depends on what you already know about the circle.
        
             
        
        
        
Alternate interior angles are congruent. So, angle 3 = angle 7. 
We see that vertical angles are congruent. So, angle 3 also = angle 5. 
Alternate exterior angles are congruent.
So, angle 3 also = angle 1.
 
        
                    
             
        
        
        
Answer:
1. -3 
2. 5
Step-by-step explanation:
Hope this helped 
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