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14p = 84
p = 84/14
p = 6
jd sisnya : 24 m, 18m, 42m
84 = 4p+3p+7p
84 = 14p
84/14 = p
6 = p
panjang setiap sisi segitiga :
4p = 4×6
= 24m
3p = 3×6
= 18m
7p = 7×6
= 42m
pnjang sisi AB = 5/5+4+3 × 120
= 5/12 × 120
= 5 × 10
= 50cm
panjang sisi BC = 4/12 × 120
= 40cm
panjang sisi AC = 3/12 × 120
= 30cm