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D2 = 17² - 8²
= 289 - 64
= √225
= 15
= 10² - 8²
= 100 - 64
= √36
= 6
JADI D2 = 15 + 6 = 21
Luas = D1 x D2 : 2
= 16 X 21 :2
= 168 cm²