For the altitude of the triangle ABC, segment DA, the region is mathematically given as
h= c sin (b)
Generally, the equation for the area of a triangle is  mathematically given as
The area of a triangle may be calculated using the formula Area
A= 1/2acsin (B)
Having said that, It has been determined that the height of the triangle ABC is the section DA.
The following is the conclusion that can be drawn from the facts presented above:
This time,
sin(B) =h/c
And,
h= c sin (b)
In conclusion, the region should be
h= c sin (b)
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