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Instructions The diameter of a circle is 2 x the radius and is basically the span of two radii across the circle's center point thus forming a horizontal line across the entire circle like the example shows. The formula is expressed as: d=2r , where d is the diameter and r is the radius. For example, if r=4 , then you multiply 4 by 2. In this case the diameter would be 6. d=8 Simple rules to remember: You always multiply the radius x 2 to get the diameter of a circle. You can divide the diameter by 2 to get the radius of a circle if the diameter is known. |