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= 1/2 * (10 - (-5)) * (3 - (-2)) + 1/2 * (10 - (-5)) * (-2 - (-9))
= 1/2 * 15 * 5 + 1/2 * 15 * 7
= 1/2 * 15 * (5 + 7)
= 1/2 * 15 * 12
= 90