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Old 05-05-2010   #16
MAS1

 
Join Date: Dec 2008
Posts: 249
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Quote:
Originally Posted by shadow123blast View Post
5. 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?
One formula for the area of a rhombus is area = (0.5)AB, where A and B are diagonals of the rhombus.

(0.5)(8)(2K) = 80
8K = 80
K = 10
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