Răspuns :
ABCD-dr
AC-diagonala
=> AC²=AB²+BC²
=> BC²=17²-15²
BC²=289-225
=> BC²=64 => BC=8 cm
AC-diagonala
=> AC²=AB²+BC²
=> BC²=17²-15²
BC²=289-225
=> BC²=64 => BC=8 cm