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s = 5 m
t = √(p² - s²)
= √13² - 5²
= √144
= 12 m...........opsi C
69. p = 17 m
s = 8 m
t = √(p² - s²)
= √17² - 8²
= √225
= 15 m...........opsi D
69. 289-64= √225 = 15 (D)