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In telecommunication, the term beamwidthhas the following meanings:1. In a radio antennapattern, the half power beam width is the angle between the half-power (-3 dB) points of the main lobe, when referenced to the peakeffective radiated power of the main lobe. See beam diameter. Beamwidthis usually but not always expressed in degrees and for the horizontal plane.2. For the optical regime, see
The answer depends on the piece of paper. You can cut it in half lengthways: it will still be a piece of paper but its width will be half as large!
Do-it-in-your-head method:Length + width is half the perimeter, ie 76 inches;76 - 36 = 40;Half of 40 is 20: this is the width;20 + 36 = 56: this is the length.Job done.
Do-it-in-your-head method: Length + width equals half the perimeter, ie 106; 106 - 8 = 98; half of 98 is 49 which is the width, making the length 57.
It is decreased by half. If you decrease the width by half and leave the length alone, you get the same result.