Perimeter and Area of Triangles and Quadrilaterals (Leaving Cert Mathematics): Flashcards

Total distance around the outside edge of a shape

Amount of space within a shape's boundaries

$l \times b$

$2(l + b)$

$x^2$

$4x$

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

Perpendicular to the base

$b \times h$

$2(a + b)$

Perpendicular distance between parallel sides

Quadrilateral with exactly one pair of parallel sides

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

$x^2 = y^2 + z^2$ where $x$ is hypotenuse