Answer:
[tex]\frac{21}{2}[/tex] units²
Step-by-step explanation:
D and E lie on the x- axis and F is vertically below D
The triangle formed is right at D with legs of length 3 and 7
The area (A) of a right triangle is found using the formula
A = [tex]\frac{1}{2}[/tex] bh ( b is the base and h the perpendicular height )
here b = 3 and h = 7, hence
A = [tex]\frac{1}{2}[/tex] × 3 × 7 = [tex]\frac{21}{2}[/tex] units ²
