Tongyuan brand, 40 mm width, one side is black, the other side is silver aluminum foil winding tape (no protective isolation paper) (sunscreen, waterproof, vinyl opaque, anti-aging), the outer diameter is 97 mm, the outer diameter of the hollow paper reel is 84 mm, the thickness of the single layer of aluminum foil tape of the black and silver combination winding insulation pipe is 0.13 mm, how many meters can a plate have?
（97-84）➗2，➗0.13
=13➗2，➗0.13
=6.5➗0.13
=50
（97+84）➗2，✖️3.1416，✖️50➗1000
=181➗2，✖️3.1416，✖️50➗1000
=90.5✖️3.1416，✖️50，➗1000
=284.3148✖️50，➗1000
=14215.74➗1000
= 14.2 meters
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