Answer:
A = 189 yd²
Step-by-step explanation:
The area (A) of a triangle is calculated as
A = [tex]\frac{1}{2}[/tex] bh ( b is the base and h the perpendicular height )
Here b = DE = 21 , h = the line from F to DE = 18 , then
A = [tex]\frac{1}{2}[/tex] × 21 × 18 = 10.5 × 18 = 189 yd²
