answer within 5 mins!

its 12*sqrt 13

The perimeter is given by :

4 * √[9^2 + 6^2 ] =

4 √117   ft.

thats wrong:(

Sorry....I forgot that

4 √117  =

4  √[9 * 13] =

4 * 3 √13=

12√ 13  ft

Is that better  ??? 

So, you would divide the rhombus into 4 right triangles. You would find the measure of the legs of those triangles by dividing the diagonals by 2. 18/2=9, 12/2=6. Now with the measures of the legs of the triangle, you would apply pythagorean theorem to find the hypotenuse, the side length of the rhombus. $${{\mathtt{9}}}^{{\mathtt{2}}}{\mathtt{\,\small\textbf+\,}}{{\mathtt{6}}}^{{\mathtt{2}}} = {\mathtt{117}}$$ √117 in simplest radical form is 3√13. Because there are four sides you would multiply 3√13 by 4. 3√13*4=12√13. So 12√13 is the perimeter. If you have any questions or feedback please tell me!

@CPhill ya...i guess

Hay, you little smart a-s-s kid. What do you mean you guess?

Someone just might do some division and multiplication on you, then you will be talking out your a-s-s full time.

You're right! This little brat needs his root squared.

Yes I think so too !

Awesomeee, this question is asked, and responded to, very rudely!

It is time for you to be polite and to start participating in your own learning.

Perhaps I have missed something but I have seen no evidence that you have learned anything from us.  

You just seem to be collecting the answers!

Next time you ask a question ask politely and tell us what ideas you have come up with on your own!

When we answer or give you a hint then respond to us, and make sure you are polite!

 We want to see if we are actually teaching you anything.

Answerers, a big thankyou to each of you :)

But Melody I think she/he may have been copying & pasting. 

And awesomeee the previous guests responded very rudely and I think you should tell them that if they say rude things again. They even said a bad word!