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Math Help - identifing expressions, PLEASE HELP!

  1. #1
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    Question identifing expressions, PLEASE HELP!

    I hate questions that use unknowns and ask you to say which ones represent areas.

    I need help on this question, please help. The question is as follows

    Here are some expressions
    (a+b)c
    ac+b
    2abc
    πa^2 + πb^2
    2πc

    The letters a,b and c represent lengths. π(pi) and 2 are numbers that have no dimentions.

    Two of the expressions could represent areas, which two?

    AH! Do you see why im stuck!?!

    PLEASE HELP!
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  2. #2
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    Quote Originally Posted by L0T3X View Post
    I hate questions that use unknowns and ask you to say which ones represent areas.

    I need help on this question, please help. The question is as follows

    Here are some expressions
    (a+b)c
    ac+b
    2abc
    πa^2 + πb^2
    2πc

    The letters a,b and c represent lengths. π(pi) and 2 are numbers that have no dimentions.

    Two of the expressions could represent areas, which two?

    ...
    The product of 2 lengths yields an area. You only have to look if you have an expression where 2 lengths are multiplied:

    \bold{(a+b) \cdot c} is obviously an area

    ac +b is the sum of an area and a length, that means no single area.

    2abc is a volume

    \bold{\pi a^2+\pi b^2} is the sum of 2 areas (of circles), that means it is an area too.

    2 \pi c is a length (the circumference of a cicle with radius c)
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