The radius of a circle is equal to half of it's diameter. If you want to figure out the radius from a given diameter, simply divide the diameter by two:
Radius = Diameter / 2
Radius = 61 / 2
Radius = 30.5 yd
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16.2 yards
1 acre = 4840 sq yd → 1½ acres = 1½ × 4840 sq yd = 7260 sq yd area circle = π × radius² → radius = √(area_circle ÷ π) = √(7260 sq yd ÷ π) ≈ 48.072 yd
A circle with a diameter of 65 yards has a circumference of 204.2 yards.
A circle with a radius of 525 yards has an area of 865,901.48 square yards.
If you want to convert that to meters, you can multiply by 0.9, approximately.