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by Anonymous on January 4th, 2009

Anonymous

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Help answer this question below.

HELP PLEASE
The area of a parallelogram is 128cm^2. The height is one half the base. Find the perimeter of the parallelogram A) 128cm B) 48cm C) not enough info
answer A B or C and tell me how you did it
i think it is C?

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  • by Anonymous on January 5th, 2009

    Anonymous

    THE ANSWER IS DEFINITELY C

    the area of a parallelogram is= b*h
    so let the height = x
    let base = 2x
    so area= 2x^2=128
    therefore x^2 = 64
    x=8

    perimeter>2b+2h
    therefore it is greater than 48
    if perimeter is 48, shape is a rectangle
    so not B

    for perimeter to be 128 cm,
    the side has to be 48 cm long
    which would screw up the base/height badly
    and thus screw up the area as well
    this is by using common sense, try
    and imagine the parallelogram with these
    dimension. you will see what i mean
    so not A

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You're reading HELP PLEASE The area of a parallelogram is 128cm^2. The height is one half the base. Find the perimeter of the parallelogram A) 128cm B) 48cm C) not enough info answer A B or C and tell me how you did it i think it is C?

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