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c = Sisi terpanjang merupakan sisi hipotunesa = p+3
a = p
b = p-3
c² = a² + b²
(p+3)² = p² + (p-3)²
p²+6p+9 = p²+ (p²-6p+9)
12p = p²
p²- 12p = 0
p (p-12) = 0
p= 0 dan p = 12, ambil p = 12
sehingga c = p+3
= 12+3
= 15
p² + 6p + 9 = p² + p² - 6p + 9
0 = p² - 12p
p(p-12) = 0
p1 = 0 ⇒ tidak memenuhi
p -12) = 0
p = 12
hipotenosa = p + 3
= 12 + 3
= 15 cm