Radius of a circle is half its diameter, 1/2 of 5cm =2.5cm
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well, the radius is half of the diameter, so if i were you id divide by two
30 x 3.14 = 94.2
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
To calculate the outside diameter of a steel coil, you first need to determine the inside diameter (ID) and the thickness of the steel material. The outside diameter (OD) can then be calculated using the formula: OD = ID + 2 × thickness. If the coil is wound in layers, you may also need to account for the number of layers by adding the thickness multiplied by the number of layers to the ID.
With the information given in the question you cannot. The volume of the pipe is pi(R2 - r2)*L where R = outer radius = outer diameter*0.5 = ID/2 + thickness = 108 mm r = inner radius = inner diameter*0.5 = ID/2 = 100 mm L = length = 1000 mm Next, to convert volume to mass, you need to multiply by the density. You then need to multiply the mass by the gravitational acceleration to convert to weight. If the mass is in kilograms, and the gravitational acceleration is in metres/second2 the result will be in Newtons, the SI unit for weight.