L’aire du trapèze

L’aire du trapèze
$$ S= \frac{\color{ForestGreen}a \color{Black}+ \color{BrickRed}b}{\color{Black}2}\cdot\color{NavyBlue}h$$
$\color{ForestGreen}a$
$\color{BrickRed}b$
$\color{NavyBlue}h$
$$\frac{\color{NavyBlue}h}{\color{Black}2}$$
$$\frac{\color{NavyBlue}h}{\color{Black}2}$$
$$ (\color{ForestGreen}a \color{Black}+ \color{BrickRed}b \color{Black} ) \, / \, 2 $$
The area of a trapezoid equals the product
of its height
by half-sum of its bases.