Step-by-step explanation:
Solution,
Area=38.5 cm²
by using the formula of are of a circle i.e, πr², we get
πr²= 38.5 cm², where π=22/7
r²=38.5 cm²/π 
r²=12.25 cm²
r=√12.25 cm²
r=3.5 cm
Now, by using the formula of circumference of a circle i.e, 2πr, we get
2πr=2×π×3.5 cm, where π=22/7
=22 cm 
So, the circumference of the circle is 22 cm.
I hope it helped U
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.2 is 1/5 as a decimal, because 2/10 broken down is 1/5. we have to write it this way (0.2) because there is no fifths place. 
        
                    
             
        
        
        
Answer:
15% of 86 = 12.9
Step-by-step explanation: