Posted by lisa on Thursday, July 14, 2011 at 8:08pm.
What is the perimeter?
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. = )
How do you think you should solve this problem?
I really have no idea. I am more confused with every question.
Are you sure that the perimeter is 60 inches?
2(2x + 9) + 3x = 60
Solve for x.
If the perimeter is 90 inches, forget the solution I posted above.
19.2 cm?
x = 19.2cm? (the perimeterr is 60 in.)
Substitute 19.2 for x and see if it works.
It does...right? Oh Lord...
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.
how about x=6...that works.
Yay! You got it!
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.
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.
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?
Ahh! It looks like you're right.