geometry
posted by joy .
a rhombus has an area of 165 square units. Of the lenght of one of its diagonals is 15 units, find the lenght of its other diagonal
I tried DR Russ
I didn't come up with answer of 22 units
could you give more direction

Think of the rhombus as a rectangle where the lines joining the midpoints are the diagonals of the rhombus.
The area of a rhombus is therefore half of product of its diagonals.
So 15*D/2=165.
Solve for D. 
A Area
AC and BD diagonals
A=AC*BD/2
165=15*BD/2
2*165=15*BD
330=15*BD Divide with 15
BD=330/15=22
go to wikipedia and type rhombus
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