Homework Help: geometry

Posted by joy on Friday, April 8, 2011 at 6:25am.

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

geometry - MathMate, Friday, April 8, 2011 at 7:21am
Think of the rhombus as a rectangle where the lines joining the mid-points 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.
geometry - Anonymous, Friday, April 8, 2011 at 10:28am
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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