There are 3.14159 (or π or pi) diameters in any circle. The "136 feet of fence in a circle" describes the circumference of the circle. The relationship of the circumference to the diameter (feet across) is pi, or 3.1415.
So there are 136/3.1415 = a little under 43.3 feet in the diameter.
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28.3 sq feet, approx.
If the circle has a diameter (all the way across) of 15 feet,then its area is 176.7 square feet, rounded to one decimal place.
It would be about 56.5 feet.
There are 20 linear feet across the diameter; and 20π ≈ 62.83 linear feet around the circumference.
If you were to fence an area that was 45 ft x 80 ft, you'd need approximately 3600 ft².