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April 19, 2026, 08:16:35 pm
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Author Topic: Volume of a triangular prism question! HELP!  (Read 645 times)  Share 

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physics

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Volume of a triangular prism question! HELP!
« on: November 02, 2010, 11:09:46 am »
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is the formula to find a pyramid 1/3 * A *h

eg. question from tssm 2010 i have sides to A B and C and i found the area using herrons formula
the height is given as 15cm
so dont i use 1/3 * the herron answer * 15cm

but TSSM answers didn't multiply the answer by 1/3 ?

thanks for help
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brightsky

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Re: Volume of a triangular prism question! HELP!
« Reply #1 on: November 02, 2010, 11:14:52 am »
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Don't need to. It's a prism. The cross-section stays the same, so the volume is (Area of Cross Section) * (Height).
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physics

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Re: Volume of a triangular prism question! HELP!
« Reply #2 on: November 02, 2010, 11:24:21 am »
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But isnt it changing? which one is it?

what does a prism mean exactly is it like a cylinder where its circle and constanly circle all the way to the top? and not a cone sorta thing  :-\
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jasoN-

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Re: Volume of a triangular prism question! HELP!
« Reply #3 on: November 02, 2010, 11:27:17 am »
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left one is a prism (triangular), right one is a pyramid (triangular)
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