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1/2 x d1 x d2 = 396
1/2 x 22 x d2 = 396
d2 = 396 : 22 : 1/2
d2 = 36 cm
396 = 1/2 x 22 x d2
396 = 11 x d2
396/11 = d2
36 = d2
thanks.
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