Answer:
This is how tackle this type of problem: 
Draw a right triangle with the indicated sides: side opposite the angle = 12 and hypotenuse = 13
Then, calculate the 3rd side by Pythagoras: x2 + 122 = 132
 x2 = 169 - 144
 x2 = 25
 x = 5
Now, we have all 3 sides of our diagram triangle, so we can find all the trig ratios for the angle.
Next, we use the double angle formula to simplify cos(x + 30) = cos x cos 30 - sin x sin 30
 = 5/13 . √3/2 - 12/13 . 1/2
 = 5√3 /26 - 6/13 
 = (5√3 - 12) / 26
Step-by-step explanation:
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The area of a circle is pi times the radius squared. the radius of this circle is 16.8cm, which is 282cm when squared. multiplied by pi it becomes 887cm.
        
             
        
        
        
Answer:
A circle has an infinite amount of symmetry 
 
        
                    
             
        
        
        
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Answer:
126 degree
Step-by-step explanation:
use alternate angles and linear pair