Geometry Gallery (polygon review)  TOPIC_SOLVED

Geometric formulae, word problems, theorems and proofs, etc.

Geometry Gallery (polygon review)

Postby teddybear101 on Wed Feb 24, 2010 10:06 pm

if given a rhombus ABCD. the perimeter of ABCD is 80 cm, CD=2x+6. find x. can i have help findinga place where i can learn this type of information. also help with this problem? :confused:
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Re: Geometry Gallery (polygon review)

Postby little_dragon on Wed Feb 24, 2010 10:08 pm

look up the def of a "rhombus"
what does it say abt the sides?
use this to find x
4(2x+6)=80
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Re: Geometry Gallery (polygon review)

Postby teddybear101 on Wed Feb 24, 2010 10:10 pm

ok, well i have tryed to solve and ended up with answer 7. is this correct ? :confused:
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Re: Geometry Gallery (polygon review)  TOPIC_SOLVED

Postby Armando on Fri Sep 17, 2010 10:19 pm

You have a rhombus ABCD. AB+BC+CD+DA = 80. CD = 2x+6.

Since all sides of a rhombus are equal, you can set up the equation:



Distribute:



Subtract 24



Divide by eight:



Simplify:




Let's check it by plugging it into the original equation.






7 is correct.
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