1.
ac=30 ⇒ ao=oc=30:2=15
cos abd=8/17
bo/ab =8/17
constatam ca 17²-8²=15²
bd=8x2=16
A=16x30/2=480/2=240
2
ducem om_I_ab
ducem on_I_ad
om=an =ad/2 ⇒ad=2om=2an
am=on=ab/2 ⇒ ab=2am=2on
Aabo=abxom/2=2on x om/2=on x om
Aado=adxon/2=2om x on/2=om x on
rezulta ca Aabo=Aado
3
sin a=24/25
ducem bm_I_ad (inaltime in triunghiul abd)
sin a = bd/10
24/25 = bd/10
bd=10x24/25=9,6
A=10x9,6=96