we know that
the area of a triangle is equal to
[tex]A=\frac{1}{2}*base*heigth[/tex]
in this problem we have
[tex]heigth=n\ yd\\base=6\ yd[/tex]
to find the area of the floor , calculate the area of the triangle
substitute the values in the formula
[tex]A=\frac{1}{2}*6*n[/tex]
[tex]A=3n\ yd^{2}[/tex]
therefore
the answer is the option
2. 3n
