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891 = 1/2 x 37 x d2
891 = 18,5 x d2
d2 = 891 : 18,5
d2 = 48
891 = ½ × 37 × d2
d2 = (891 × 2) : (1 × 37)
= 1782 : 37
= 48,16 cm