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Math Help - Expression for surface area

  1. #1
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    Question Expression for surface area

    Here's my question :

    Expression for surface area-sa.jpg

    Please don't just given the answer. I need to know how to do it. Thank you.
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  2. #2
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    Re: Expression for surface area

    Start by drawing a net of this shape. Then evaluate the area of this net by summing the areas of all the pieces.
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  3. #3
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    Re: Expression for surface area

    four squares, all x by x

    two rectangles, all x by 5x/8

    two triangles (each 1/2 base times height) ... sketch an altitude perpendicular to the ground, the use Pythagoras to find the height.
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