Question

follow these steps to derive the trigonometric area formula. 1. for △abd, sin(a) =

Explanation:

Step1: Recall sine - definition in right - triangle

In right - triangle $\triangle ABD$, the sine of an angle in a right - triangle is defined as the ratio of the opposite side to the hypotenuse.
$\sin(A)=\frac{h}{c}$

Answer:

$\frac{h}{c}$