Answer:
see explanation
Step-by-step explanation:
Using the ratio equality for circles
 =
 = 
(a)
Note the angle at the centre of the shaded arc is 360° - 90° = 270°, thus
 =
 =  =
 =  ( cross- multiply )
 ( cross- multiply )
3C = 180 ( divide both sides by 3 )
C = 60 mm
(b)
Note the angle at the centre of the shaded arc is 360° - 135° = 225°, thus
 =
 =  ( cross- multiply )
 ( cross- multiply )
225C = 1188 ( divide both sides by 225 )
C = 5.28 cm
 
        
             
        
        
        
Answer:

Step-by-step explanation:
 
        
             
        
        
        
 
Perimeter<span> and area are two important and fundamental mathematical questions</span>
 
        
                    
             
        
        
        
Answer:
x = 6
y = -2
Step-by-step explanation:
6 - 8 = -2
2 x 6 = 12 - 14 = -2