- teddybear101
**Posts:**30**Joined:**Tue Jan 12, 2010 5:54 pm**Location:**Atlana, GA (cobb county)-
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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?

- little_dragon
**Posts:**222**Joined:**Mon Dec 08, 2008 5:18 pm-
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look up the def of a "rhombus"

what does it say abt the sides?

use this to find x

4(2x+6)=80

what does it say abt the sides?

use this to find x

4(2x+6)=80

- teddybear101
**Posts:**30**Joined:**Tue Jan 12, 2010 5:54 pm**Location:**Atlana, GA (cobb county)-
**Contact:**

ok, well i have tryed to solve and ended up with answer 7. is this correct ?

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.

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.