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Formula to calculate the Blank Diameter: ID+ID/24+(2/3*KR)+2*SF Where, ID = Inner Diameter KR = Knuckle Radius(generally it will be taken 15% of ID) SF = Straight Face
There are 9 square feet (sf) in a square yard (sy). This is because a square yard is defined as a square with each side measuring 3 feet, and when you calculate the area (3 feet x 3 feet), you get 9 square feet.
SF Grei was created in 1919.
For any arithmetic operation, the number of significant digits in the operands determines the maximum number of significant digits in te answer. There is no point in trying to calculate a highly precise answer if your operands cannot justify it. For example, if you are using pi = 3.14, (3 sf) then there is no point in measuring the radius of a circle to 7 sf and giving its area to 10 sf.
196,600 sf = 4.513 acres