Use Pythagoras theorem

Two triangles are similar

(6+3)*12/2 - 6*8 /2 = 30
 
        
                    
             
        
        
        
z = 37°
Step-by-step explanation:
The exterior angle theorem says that the sum of two internal angles is equal to the exterior angle
In this case the sum of z and z+4 will be equal to z+41
Writing mathematically

Hence
z = 37° 
Keywords: Angles, Triangles
Learn more about angles at:
#LearnwithBrainly
 
        
             
        
        
        
I'mthat'sAnswer:
ima be honest I'm not that intelligent thats why im on here but if I'm not mistaken divide y by x and u should have your answer
Step-by-step explanation:
 
        
             
        
        
        
Circumference = 2 x radius x Pi
Circumference = 2 x 0.8 x pi
Circumference = 1.6pi or 5.024 yards
area = r^2 x pi
Area = 0.8^2 x pi
Area = 0.64pi or 2.0096 square yards