EN: Diagonal screen
See Diagonal. Screen 9 x 12 feet has 15 foot diagonal.
Canon glossary us
Screen size measured across screen between corners of two longest sides. Also computable using Pythagorean theorem: add square of width and square of height, take square root of sum. Therefore, 16:9 screen 49 x 87 inches has 100 inch diagonal, 4:3 screen 60 x 80 inches also has 100 inch diagonal.
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