Question

Va rog, am nevoie urgent de problema 10

Answer 1

Explicație pas cu pas:

a) Fie DM //AC ( M €AB)=> mMDO=mCOD=90 (alterne interne) => triunghiul MDB dreptunghic si cum DA_|_ AB => DA_|_MB => T.Inaltimii AD²=AM×AB => AD²=DC×AB => AD²=12×48 => AD=24cm

A ABCD = (DC+AB)×AD/2 = 60×24/2 =30×24=720 cm²

b) Fie CN_|_AB => CN=AD=24 si NB=36

in triunghiul CNB => T.Pitagora BC=12V13

A ABC = A ABCD-A ADC=576cm²

=> 576=AA'×6V13 ( AA' perpendicularBC) => AA'=96V13/13