How do you eat the most nutritious health when eating persimmons in the fall?
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The formula of the area of the circle: radius × radius × 3.14 (pi).
BV monofilament diameter and number
BV monofilament diameter and number
For example, BV2.5, the national standard diameter is 1.78mm, and the radius is 0.89mm.
Therefore, the cross-sectional area is: 0.89 × 0.89 × 3.14 = 2.487194 is approximately equal to 2.5 mm & sup 2; / square mm.
The following analogy, 1-6 squares are single core diameter, more than 10 squares for multicore