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A rectangular block is 2 cm wider than it is high and twice as long as it it wide. Let x cm be the height of the block.
Find an expression for the total surface area, A cm2, in term of x.

  • math -

    Let L,W and H be the dimensions of the rectangular block.

    Total surface area
    A=2(LW+WH+HL)

    So if
    H=height=x
    then
    W=x+2, and
    L=2W=2(x+2)
    Substitute these values of H,W and L into the equation for A and simplify.

  • math -

    on a piece of paper draw a rectangle paddock 20 cm long and 10 cm wide
    ?

  • math -

    on a piece of paper draw a rectangle paddock 20 cm long and 10 cm wide ?

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