Answer:
The area of a triangle is equal to its base times its height divided by 2: \begin{align*}A=\frac{bh}{2}\end{align*}. In order to find the composite area of two or more shapes, simply find the area of each shape and add them together.
Step-by-step explanation:
18.725 = 18725/1000 = 3745/200 = 749/40 = 18 29/40
so, your answer is 18 29/40
I think what you are wanting id 0.1 is that rounded to one significant figure
