split it into a net shape and find he areas
if you look and reead carefully
equilataral, means all sides are equal, also means that te heights of all side rectangles are the same
so we only need to find the area of the 2 triangles and the 3 rectangles
area of triangle=1/2bh
b=5
h=4.3
since 2 triangles, times 2
1/2*2*5*4.3=21.5
the 3 rectangles
area=legnth times width
legnth=20
width=5
3 of them so times 3
3*20*3=300
find total by adding
21.5+300=321.5
2nd is anser
