| Links ordered by themes: |
| fraction geometry equations arithmetic operation trigonometry accessories |
| themes class 8 |
| simplify terms |
| solve equations |
| areas and volumes |
| solve "unequations" |
| binominal series |
| equations with variables |
| fraction-termes |
| For rhombus with side a and the diagonal e and f is: area: (e * f)/2 perimeter: a * 4 a = root of (e/2)²+(f/2)² The angles will be calculated in a simple way, if you disperse the rhombus into four right- angled- triangles. |
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