Răspuns:
a) BD=BC-DC=25-16=9cm
Folosind teorema catetei aflam:
AB²=BD×BC
AB=√9×25=3×5=15cm
AC²=CD×CB
AC=√16×25=4×5=20cm
Folosind teorema înaltimii aflam:
AD²=BD×DC
AD=√9×16=3×4=12cm
b) AC²=CD×CB
24²=CD×40
576=CD×40
CD=576:40 CD=14,4cm
BD=BC-DC=40-14,4=25,6cm
AB²=BD×BC
AB=√25,6×40=√1024=32cm
AD²=BD×DC
AD=√25,6×14,4=√368,64=19,2cm
c) BD=BC-DC=10-6,4=3,6cm
AB²=BD×BC
AB=√3,6×10=√36=6cm
AC²=CD×CB
AC=√6,4×10=√64=8cm
AD²=BD×DC
AD=√3,6×6,4=√23,04=4,8cm