Hi :)
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CIRCUMFERENCE
- The distance all around the circle. Calculated:
.
PI
- An irrational number. Equals the ratio of a circle's circumference to its diameter. It's approximately 3.
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We have the function:

A turning point happens when the function reaches a maximum or a minimum.
In that points the value of the first derivative of the function is equal to 0.
So we can find the turning points by finding the first derivative and equal to zero:
Answer:
BGHA
Step-by-step explanation:
You have to find all of the coordinates first in the order they are written:
(0,4)
(-4,3)
(2,0)
(0,-1)
Now use the code at the right to find the letters for each coordinate:
(0,4) B
(-4,3) G
(2,0) H
(0,-1) A
Now write it in this order (all caps): BGHA.
Hope it helps and is correct!