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October 20th, 2008, 07:34 AM  #1 
Newbie Joined: Oct 2008 Posts: 6 Thanks: 0  Need help with a question concerning a Rhombus
A rhombus has sides of length 10, and it's diagonals differ by 4. What is the area?

October 20th, 2008, 01:18 PM  #2 
Senior Member Joined: Jul 2008 Posts: 895 Thanks: 0  Re: Need help with a question concerning a Rhombus
Hint: diagonals intersect at right angles. If half of one diagonal is h, then half the other is ...? Now use Pythagoras. Not that it matters much in this calculation, but the four quarter triangles are equal in area, and in fact are congruent. 

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