Coordinate Geometry of Rhombii
Common Core: G.GPE.4

Coordinate Geometry of Rhombii

Author: Graham Pardun
This lesson will demonstrate how to use slope, midpoint, and distance formulas to determine from the coordinates of the vertices if a quadrilateral is a rhombus in a coordinate plane.
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Let Me Ask You Something: Is It a Rhombus?

Suppose you're given four coordinates, like A(2,3), B(-70,2), C(24,10), and D(5,6). What kind of quadrilateral is ABCD? Is it a rhombus? Here's how to prove what it is, and what it isn't!