

The diagonals of a rhombus bisect each other at right angles (90°).
Try this Drag the orange dots on each vertex
to reshape the rhombus. Notice the behavior of the two diagonals.
In any
rhombus,
the diagonals (lines linking opposite corners)
bisect each other at right angles (90°).
That is, each diagonal cuts the other into two equal parts, and the angle where they cross is always 90 degrees.
In the figure above drag any
vertex
to reshape the rhombus and convince your self this is so.
Area
The area of a rhombus can be found as half the product of the two diagonal lengths. For more on this see
Area of a rhombus.
Other polygon topics
General
Types of polygon
Area of various polygon types
Perimeter of various polygon types
Angles associated with polygons
Named polygons
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