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Sagot :

Bonjour


Théorème de pythagore :


DG^2 = DH^2 + HG^2

DG^2 = 3^2 + 3^2

DG^2 = 9 + 9

DG^2 = 18

AG^2 = AD^2 + DG^2

AG^2 = 3^2 + 18

AG^2 = 9 + 18

AG^2 = 27

AG = V27

AG ~ 5,2 cm

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