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  1. how much dirt is in a round hole that is 9 feet deep with a diameter of 3 feet? (1)3 feet=3*0.305=0.915meter (2)9 feet deep =9*0.305=2.745 Volume=(0.915/ 2 )*( 0 .915/2)*π*2.745=1.805 (M^3,立方米)