Question

What is the surface area of this triangular prism rounded to the nearest tenth 3.6 km 8.5 km 7.7 km 1.8 km

Answer 1

the picture in the attached figure

we know that
[surface area]=2*[area of the base]+[perimeter of the base]*height
area of the base=3.6*7.7/2----> 13.86 Km²
perimeter of the base=3.6+7.7+8.5-----> 19.8 Km
height=1.8 Km

[surface area]=2*[13.86]+[19.8]*1.8-------> 63.36 Km²-----> 63.4 Km²

the answer is
63.4 Km²