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To find the area of a triangle, you can use the formula:
Area = 1/2 * base * height
In this case, the base is 8 inches and the height (or the length of the left side) is 10 inches.
Area = 1/2 * 8 * 10
Area = 40 square inches
Therefore, the area of the triangle on the bottom base is 40 square inches.