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The standard width of tape - it measures one inch across. Other common sizes are 1/2" (12mm) or 2" (50mm)
Twenty one hundred in standard form is written as 2100. In standard form, numbers are expressed in the form of a single digit followed by any necessary zeros.
The lane that goes straight through without changing is the main lane. If you merge into that lane, you have to yield to the flow of traffic. That means if your lane ends, it is you that should yeild.
Sounds like you're talking about the main lobe of a radio antenna.It's kind of sloppy to say that the "max" extends across some width, since the "max"only happens in one single, specific direction.The "beam-width" is also often referred to as the "3dB beam-width". It's the angle betweenthe two points where the power is 3 dB less than the max ... one point on each side of the max.
Length + length + width + width = perimeter. Length + width x 2 = perimeter