The diameter of the bottom surface of a conical steel part is 4cm, which is 8 / 9 of the height. If the steel weight per cubic centimeter is 7.8G, how much is the weight of the part? (keep the integer result)
_ Half of my life,
Height: 4 △ 8 / 9 = 4.5 (CM)
Volume: 3.14 × 4.5 × 1 / 3 = 18.84 (cm3)
Weight: 18.84 × 7.8 = 146.952 (g) ≈ 147 (g)
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