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The area of the quadrilateral can be calculated by dividing it into two triangles.
Each triangle has a base of 7 cm and a height of 12 cm.
The area of each triangle is calculated as:
1/2 * base * height = 1/2 * 7 * 12 = 42 cm^2
Since there are two triangles, the total area of the quadrilateral is:
42 cm^2 + 42 cm^2 = 84 cm^2
Therefore, the area of the quadrilateral is 84 cm^2.