triangulation - Related information

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  how to use JavaScript to calculate the coordinates of x2 and y2 after the elements in the figure are rotated? the center point of rotation is the center point of dashed wireframe ...

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  Jul.16,2022
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b37b88-2c0c2.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b37b88-2c0c2.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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