Website Statistics Bonjour Je narrive pas à faire lexercice 67 ci joint Merci de maider

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danielwenin

DCB = 30° tan 30° = DB/4 => DB = 4tan30° = 4V3/3

triangle ADB rectangle

DBC = 60 => ADB = 30° et DAB = 60°

triangel EDC: tan60° = ED/5 => ED = 5V3

EC² = 75 + 25 = 100 => EC = 10

Aire EDC =2,5.5V3 = 12,5.V3

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