Question

A farm is to be built in the shape of Quadrilateral ABCD, as shown below.

Answer 1

When we have diagonals $d_1$ and $d_2$ of a rhombus its area is:

$A=\dfrac{1}{2}\cdot d_1\cdot d_2=\dfrac{1}{2}\cdot |AC|\cdot |BD|=\dfrac{1}{2}\cdot12.6\cdot10.4=\dfrac{1}{2}\cdot 131.04=\\\\\\=\boxed{65.52\text{ feet}^2}$

Answer C)