Question

deriving the trigonometric area formula
follow these steps to derive the trigonometric area formula.

1. for $\triangle abd$, $\sin(a) =$

Explanation:

Step1: Recall sine definition

In right $\triangle ABD$, $\sin(\theta) = \frac{\text{opposite}}{\text{hypotenuse}}$. For $\angle A$, the opposite side is $h$, hypotenuse is $c$.
$\sin(A) = \frac{h}{c}$

Answer:

$\frac{h}{c}$