Răspuns:
BD/CD = 0,5625 = 5625⁽⁶²⁵/10000 = 9/16
BD/CD = 9/16 => BD = 9CD/16
AD² = CDₓBD
inlocuim BD
12² = CDₓ9CD/16
144ₓ16 = 9CD²
2304 = 9CD²
CD² = 2304/9
CD² = 256
CD = 16 cm
BD = 9ₓ16/16 => BD = 9 cm
BC = BD + DC = 9 cm + 16 cm => BC = 25 cm
AB² = BDₓBC
AB = √9ₓ25
AB = √225
AB = 15 cm
AC² = CDₓBC
AC = √16ₓ25
AC = √400
AC = 20 cm