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The points $(4, 0)$ and $(-4, 0)$ are two non-consecutive vertices of a rhombus with an area of $80$ square units. One of the other vertices is $(0, K)$ where $K > 0$. What is the value of $K$?

 Nov 2, 2017
edited by michaelcai  Nov 2, 2017

The area of a rhombus =


(1/2) product of the diagonal lengths


One diagonal length is 8.....so the other must be 20


And the mid-point of this diagonal is at the origin


So.....(0,10)  and (0, -10)   are the other two vertices


So....K  must be 10



cool cool cool

 Nov 2, 2017

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