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ΔKLN sebangun dengan ΔKLM.
Sehingga berlaku rumus perbandingan :
KL² = NL x LM = 9 x (9 + 16) = 9 x 25 = 225
KL = √225 = 15
NK² = KL² - NL²
= 15² - 9²
= 225 - 81
= 144
NK = √144
= 12
KM² = ML² - KL²
= 25² - 15²
= 625 - 225
= 400
KM = √400
= 20
Jadi,
Panjang NK = 12, KL = 15, MK = 20