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A comment on In 1930, the 22M-pound Indiana Bell building was rotated 90 degrees. Parent comment

Re:In 1930, the 22M-pound Indiana Bell building was rotated ... by 1letterunixname on Wednesday April 19, 2023 @07:57PM (#35634787)
Let's find the 2D (3x3) translation matrix for this.

For angle representation, better use gradians because radians and degrees are too easy.

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