По теореме Пифагора ищем BF:
13²-5² = 169 - 25 = 144
BF = 12
FC = 18 - 12 = 6
Ответ: 6.
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По теореме Пифагора ищем BF:
13²-5² = 169 - 25 = 144
BF = 12
FC = 18 - 12 = 6
Ответ: 6.