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288 = 36 × t
t = 288/36
t = 8 cm
BC² = BF² + t²
= 18² + 8²
= 324 + 64
= 388
BC = √388
= 19,69 cm
Keliling = 2 (AB + BC)
= 2 (36 + 19,69)
= 2 × 55,69
= 111,38 cm