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√15² - (3/2)²
= √225 - 9/4
= √900/4 - 9/4
= √891/4
= √81.√11 / √4
= 9√11 / 2
= 9/2 √11 cm
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T terhadap bidang ABCD
√(9/2 √11)² - (3/2)²
= √891/4 - 9/4
= √882/4
= √441.√2 / √4
= 21√2 / 2
= 21/2 √2 cm