Answer
$159.5 \ m, \ 796\ m^2$
Work Step by Step
Since the perimeter of a triangle is the sum of the lengths of the sides, then we have
$$perimeter=46+73.9+39.6=159.5 \ m
.$$
Also, the area is given by
$$
Area= \frac{1}{2} base \times hight=\frac{1}{2}\times39.6\times 40.2=795.96\ m^2\approx 796~m^2
.$$
