geometry

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an isosceles triangle has a perimeter of in. the congruent sides measure (2x+9)cm. The length of the third side is 3 x cm. what is the value of x?

  • geometry - incomplete -

    What is the perimeter?

  • geometry -

    an isosceles triangle has a perimeter of 60 in. the congruent sides measure (2x+9)cm. The length of the third side is 3x cm. what is the value of x?

    Again...sorry. = )

  • geometry -

    How do you think you should solve this problem?

  • geometry -

    I really have no idea. I am more confused with every question.

  • geometry -

    Are you sure that the perimeter is 60 inches?

    2(2x + 9) + 3x = 60

    Solve for x.

  • geometry -

    If the perimeter is 90 inches, forget the solution I posted above.

  • geometry -

    19.2 cm?

  • geometry -

    x = 19.2cm? (the perimeterr is 60 in.)

  • geometry -

    Substitute 19.2 for x and see if it works.

  • geometry -

    It does...right? Oh Lord...

  • geometry -

    I'll bet the perimeter is 60 cm.

    2(2x + 9) + 3x = 60
    2(38.4 + 9) + 3(19.2) = 60
    94.8 + 57.6 does not equal 60

    Work this equation.

    2(2x + 9) + 3x = 60

    You should find that x is a whole number between 5 and 10.

  • geometry -

    how about x=6...that works.

  • geometry -

    Yay! You got it!

  • geometry -

    really..cuz that answer I didn't convert cm to inches. when I do I get x = 18.86 now. Please confirm. my brain hurts.

  • geometry -

    Are you absolutely sure that the perimeter was given in inches, not centimeters?

    If you are -- then I'm off base because I've figured the perimeter as 60 centimeters.

  • geometry -

    no, the perimeter is 60 inches. ha..hence the confusion.
    1 in = 2.54 cm
    60 in =152.4cm
    7x=152.4-18
    7x=134.4 / 7
    x=19.2cm

    Whadda ya think?

  • geometry -

    Ahh! It looks like you're right.

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