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In a rhombus, diagonals bisect each other and are perpendicular.
Therefore, the diagonals divide a rhombus in four congruent right-angled triangles.
Then the length of each side of the given rhombus is = = = = 10 cm.
Solved.
On properties of rhombis see the lessons in this site
- Diagonals of a rhombus are perpendicular
- Diagonals of a rhombus bisect its angles
- The length of diagonals of a rhombus
- A circle inscribed in the rhombus
- HOW TO solve problems on the rhombus sides and diagonals measures - Examples
- The length of diagonals of a rhombus
- PROPERTIES OF RHOMBIS
Also, you have this free of charge online textbook on Geometry
GEOMETRY - YOUR ONLINE TEXTBOOK
in this site.
The referred lessons are the part of this textbook under the topic "Properties of rhombis".