Răspunsuri

2014-06-05T16:09:01+03:00
R= \frac{abc}{4S}
S=AD*BC/2
ΔADC Δ dreptunghic, AD inaltime, mediana mediatoare (deoarece ABC Δ isoscel)
AD²=AC²-DC²=225-81=144
AD=12
S=12*18/2=108
R=15*15*18/4*108=9.375