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40 cm = 4 dm
Obj = Pole podstawy × h
84 = 6 × 4 ÷ 2 × h
84 = 12h
h = 7 [dm]
Jako, żę są to przekątne wzór to
a × b ÷ 2
d2=40cm = 4dm
V= d1*d2/2 * H
84= 6*4/2 * H
84= 12H
H=7