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AC = 40
BC = 50
BD = AB²/BC = 30²/50 = 900/50 = 18
DC = 50-18 = 32
DC = AD²/18 ⇒ AD² = DC × 18
⇒32 × 18 = 576
AD⇒ √576 = 24
⇒DE = 12 = AE
BE² = BD² + DE² = 18² + 12² = 6² × 13
CE² = DC² + DE² = 32² + 12² = 4² × 73
⇒BE + CE = 6√13 + 4√73
AB² +AC² =BC²
30² + 40² =BC²
900 +1600=BC²
2500 =BC²
√2500 =BC
BC =50 cm