Area of a Polygon (Grade 11 NSC Matric Mathematics): Flashcards

Closed shape made of straight lines

$s^2$ where $s$ is side length

$b \times h$ (base × height)

$\frac{1}{2}b \times h$

Must be perpendicular to base, not slanted side

$\frac{1}{2}(a + b) \times h$

$b \times h$ (base × perpendicular height)

Use perpendicular height, not slanted side

$\pi r^2$ where $r$ is radius

$2\pi r$ where $r$ is radius