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maka
AB² = OA² - OB²
⇒ AB² = 25² - 7²
⇒ AB² = 625 - 49
⇒ AB² = 576
⇒ AB = √576
⇒ AB = 24 cm
Jadi,,
L OABC = 2 · LΔ AOB
= 2 · 1/2 · AB · OB
= AB · OB
= 24 · 7
= 168 cm²
Jawab : B
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