Answer: 30.84 feet
This value is approximate. I used pi = 3.14
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Step-by-step explanation:
Consider a full circle of diameter 12 feet. The circumference is
C = pi*d
C = 3.14*12
C = 37.68
This is the approximate perimeter around the circle. Use more decimal digits of pi to get a more accurate value. You could also use your calculator's stored value of pi.
Since she has a semicircle, aka half circle, this means we cut that value in half to get 37.68/2 = 18.84
The distance around the curved portion of her garden is roughly 18.84 feet
Add on the straight line portion (the diameter) to get 18.84+12 = 30.84 feet