Answer:
A = 189 yd²
Explanation:
The area (A) of a triangle is calculated as
A = bh ( b is the base and h the perpendicular height )
Here b = DE = 21 , h = the line from F to DE = 18 , then
A = × 21 × 18 = 10.5 × 18 = 189 yd²
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bh ( b is the base and h the perpendicular height ) × 21 × 18 = 10.5 × 18 = 189 yd²