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P(k) + P(k) + P(a) ≤ K
2(P(k)) + P(a) ≤ 77
2 (5P(a)) + P(a) ≤ 77
10P(a) + P(a) ≤ 77
11P(a) ≤ 77
P(a) ≤ 77/11
P(a) ≤ 7 cm
misal sisinya => a,b&c
a&b = sisi yg sama panjng
c = sisi lainnya (alas)
a atau b = 5c
77 ≥ a+b+c
77 ≥ 5c + 5c + c
77 ≥ 11c
7 ≥ c
panjang alas maksimum = 7 cm