r=200 ft
d= 400 ft
c= πd
= 3.14 x 400
c= 1256ft
a= πr²
r² = 40, 000.... (remember always do the indicies first because of B.I.D.M.A.S)
3.14 x 40, 000
AREA = 125, 600 ft²
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the sq. footage of the circle would be 3.14(radius squared). if the diameter is 200ft, then the radius is 100ft. So, 3.14(100x100)= 3.14(10,000)= 31,400 sq. feet
100. The radius is 1/2 of the diameter.
Area = pi times radius2 where radius = 200 feet therefore area = pi times 2002 Area = 125 663.7 feet2
Area = pi * radius2 628mm2 = 3.14 * radius2 dividing by pi (approximately 3.14) 200mm2 = radius2 Taking the square root of 200, 14.14mm is the radius. The diameter is twice the radius, so the diameter is 28.28mm.
acre = 43,560 square feet = 4,840 square yardsArea of a circle = (pi)·(radius)2 = (pi)·(200)2 = 125,663.7 square yards = 25.964 acres (rounded)