Răspunsuri

2014-09-11T16:28:36+03:00
ΔADB, mD=90
AB²=AD²+DB²
AD²=256-225
AD²=31
AD=√31
P =2AD+2DC
P=2√31+32
Construiesti inaltimea DM
DM= \frac{AD*DB}{AB}
DM= \frac{15 \sqrt{31} }{16}
Aria= DM*AB
aRIA= \frac{15 \sqrt{31} }{16} *16= 15 \sqrt{31}