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In cubulabcda'b'c'd' de latura AB=12 cm ,distanta de la A la planul (BDD') este?

Răspuns :

DD'_|_(ABC)}
AO inclus in (ABC)}=>DD'_|_AO<=>AO_|_DD'
fie {O}=AC intersectat cuBD
AO_|_BD
DD',BD incluse in (BDD')=> AO_|_(BDD')
AO=AC/2=(12 radical din2)/2
AO=6 radical din2