Polygons (Grade 12 NSC Matric Mathematics): Flashcards

Flat, closed figure with 3+ straight line segments connected

$\frac{1}{2} \times \text{base} \times \text{height}$

Must be perpendicular to base (90° angle)

$\text{base} \times \text{height}$

$\text{base} \times \text{height}$ or length × width

$\frac{1}{2} \times \text{diagonal}_1 \times \text{diagonal}_2$

$\text{side}^2$

$\frac{1}{2} \times \text{(parallel sides sum)} \times \text{h}$

$\frac{1}{2} \times \text{diagonal}_1 \times \text{diagonal}_2$

Always intersect perpendicularly (at right angles)