Respuesta :

We have to find the area of the triangle

[tex]A=\frac{bh}{2}[/tex]

Where b = 20 and h = 6.

[tex]A=\frac{20\cdot6}{2}=60m^2[/tex]

If one bag covers 20 square meters, then Betsy needs 3 bags to cover it all.

Hence, the answer is B.