Slope. The hypotenuse of the red triangle has slope 3/8, and the slope of the cyan triangle has slope 2/5. Since 3/8 < 2/5, the "hypotenuse" of the upper figure bends inward, and the "hypotenuse" of the lower figure bends outward. The bending accounts for the difference in area between the two figures.

Slope. The hypotenuse of the red triangle has slope 3/8, and the slope of the cyan triangle has slope 2/5. Since 3/8 < 2/5, the "hypotenuse" of the upper figure bends inward, and the "hypotenuse" of the lower figure bends outward. The bending accounts for the difference in area between the two figures.

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