In 4 through 8, a solid ettends alortg tlte r-ais ft'otn r
Chapter 6, Problem 4(choose chapter or problem)
In 4 through 8, a solid ettends alortg tlte r-ais ft'otn r : a to r : b. attd its ct'oss-section arca al -\ iJ A(.r). Fi,l/ i.t tolutte.
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