Answer:
<h2>D.</h2>
Step-by-step explanation:
The formula of an area of a triangle:
<em>b</em><em> - base</em>
<em>h</em><em> - height</em>
<em />
Look at the picture.
The formula of a distance between two points on a vertical line:
The formual of a distance between two points on a horizontal line:
Calculate the lengths of <em>b</em> and <em>h</em>:
Substiute to the formula of an area: