For Exercises 11 and 12, use Brahmagupta's Formula. 11. For cyclic quadrilateral ABCD, find the area if AB = 39 mm, А 52 mm, CD and DA = 60 mm. ВС 25 mm, 12. For cyclic quadrilateral ABCD, find 6 cm, BC = 7 cm, the area if AB 6 ст, D CD 2 cm, and DA = 9 cm.

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