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The volume of a rectangular prism is length x height x width. So in this case, the volume is 8 x 3 x 5 = 120.
In general you cannot. The area of a regular pentagon with sides of length 5 units is 52*5/4tan(pi/5) 43.012 square units.Then, if the prism's height is 10 units, the volume is 43.012*10 = 430.12 cubic units.
30
It is: 10*5*5 = 250 cubic cm
To find the volume of a rectangular prism, you multiply (length)(width)(height). In this case, you multiply 6 times 5 times 3, and your answer is 180.