AREA AND DIMENSIONS OF A CIRCLE Circumference of a circle=Diameter x 3.1416 Area of a circle=Square of diameter x .7854 Diameter of a circle=Circumference x .31831 Size of a square of equal area to a circle=Diameter x .8862 Diameter of a circle of equal area to a square=Side of a square x 1.1284 THE WEIGHT OF ROUND BARS Square the diameter (mm); multiply by 6 and divide by 1000. Result gives approximate weight in kgs per metre. THE WEIGHT OF FLAT AND SQUARE BARS Take area in square mm and divide by 128. Result gives approximate weight in kgs per metre. WEIGHTS AND AREAS OF STEEL Plates & Sheets Width in m x length in m=Area in m2 Thickness in mm x 7.85=Kilogrammes per m2 Flat Bars and Squares Width in cm x thickness in cm=Area in cm2 Area in cm2 x .785=Weight in kilogrammes per metre Round Bars Diameter2 in cm x .7854=Area in cm2 Diameter2 in cm x .6165=Kilogrammes per metre Hexagons Distance A/F2 in cm x 0.866=Area in cm2 Distance A/F2 in cm x 0.68=Kilogrammes per metre

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