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Formula Reference Sheet
This chapter
Area formulas
| Parallelogram | Area = base × height |
|---|---|
| Rectangle | Area = length × breadth |
| Rhombus (diagonals) | Area = ½ × d₁ × d₂ |
| Square | Area = side² = ½ × diagonal² |
| Trapezium | Area = ½ × (a + b) × h |
| Kite | Area = ½ × d₁ × d₂ |
Diagonal & angle properties
| Rectangle diagonal | d = √(l² + b²) |
|---|---|
| Square diagonal | d = side × √2 |
| Rhombus side | side = ½ × √(d₁² + d₂²) |
| Parallelogram angles | adjacent angles sum to 180° |
| Diagonal sum law (parallelogram) | d₁² + d₂² = 2(a² + b²) |
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