9 x 14 = 126 square inches
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Area = 12*8 = 96 square inches
area=base*height 7.3*2.4=17.52
If you mean a rectangle and not a square then the area is 14 times 9 = 126 square inches
If you draw a diagonal in a rectangle you get two equal triangles, each half the area of the rectangle. Area of rectangle is base x height, so half of that is ½ x base x height. QED
Divide the area by the height