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C. 42 cm
Penjelasan dengan langkah-langkah:
AB² = 10² - (15-9)²
= 100 - 6²
= 100 - 36
= 64
AB = √64 = 8 cm
K = AD + AB + BC + CD
= 15 + 8 + 9 + 10
= 42 cm