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Misal : AB = a, CD = bTarik garis dari C ke AB, sehingga sisi alas menjadi (a - b) beri nama E
Pythagoras :
(BC)² - (BE)² = (CE)²
(a + b)² - (a - b)² = 12²
a² + 2ab + b² - (a² - 2ab + b²) = 144
a² + 2ab + b² - a² + 2ab - b² = 144
4ab = 144
ab = 36
Sehingga AB x CD = 36