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olga2289 [7]
3 years ago
14

Please help me quickly

Mathematics
1 answer:
Assoli18 [71]3 years ago
4 0

Answer:

AB = 13.964 cm

Step-by-step explanation:

BF² = 6² + 13²

BF² = 36 + 169

BF² = 205

AB² = AF² - BF²

AB² = 20² - 205

AB² = 400 - 205 = 195

AB = 13.964 cm

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