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Taper angles of taper pipe threads

【英】困ったときの知恵袋詳細
Cutting Taps Pipe Threads Standard (Screw Threads, Center Holes)
Tell me about the "Taper" and "Taper angle" of the Japan PT Tapered pipe thread, an ISO R and Rc Tapered pipe thread and an American Tapered pipe thread (NPT・NPTF).
The Taper rate for PT, R, Rc and American tapered pipe threads is 1 in 16 or 3?4 inch taper per foot (62.5 millimeters per meter) measured by the change of diameter of the pipe thread over the length of the thread.

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