Answer:
The area of triangle DEF is [tex]189\ yd^2[/tex]
Step-by-step explanation:
we know that
The area of a triangle is equal to
[tex]A=\frac{1}{2}(b)(h)[/tex]
where
b is the base of triangle
h is the height of triangle
In this problem
In the triangle DEF we have
[tex]b=21\ yd\\h=18\ yd[/tex]
substitute the values in the formula
[tex]A=\frac{1}{2}(21)(18)[/tex]
[tex]A=189\ yd^2[/tex]
