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A few classmates were together playing cards and chatting casually. One kid casually asked, "What cup size is the 'four taels of breast' in the saying 'The value of friendship is worth a thousand gold pieces, yet it can't match four taels of breast'?" Then another kid immediately picked up pen and paper and started calculating. The calculation process went like this: Four taels = 200 g, so the mass m of one RF (breast) = 100 g. Assuming the density of the human RF is the same as human fat density (0.79 g/cm³), the volume V of one RF = 126.6 cm³. Approximating the shape of the RF as a hemisphere: 1/2 * 4/3 * πr³ = 126.6 cm³, solving for r gives a radius r = 3.92 cm. The difference in the upper and lower circumference is approximately the difference in the perimeters of two ellipses. The ellipse perimeter formula is L = π(a + b), where the b values of the two ellipses are equal, and the difference in a values equals the RF radius r. So, ΔL = πr = 12.3.

According to cup size classifications, AA is about 7.5 cm, A about 10 cm, B about 12.5 cm, C about 15 cm, D about 17.5 cm, and E about 20 cm. Therefore, four taels of breast is at most a small B cup, which means that even a friendship worth a thousand gold pieces still can't match a small B cup.