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Let OA = a r , OB = a 12 r + b 4 r , and OC = b r where O is the origin, If S is the parallelogram with adjacent sides OA and OC, then S of area BC OA ral quadrilate the of area is equal to _______

1. 6
2. 7
3. 10
4. 8

Correct answer: 8

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