we have a triangular prism
the surface area will be the total area of all the sidesand all the faces,
we have 2 triangles
and 3 rectangles
if we can "open"our prism
A=1/2 b*h is to find the triangle area
the height is 16-10=6
A triangle= 1/2*13*6=13*3=39 cm^2
we can use the formula
I will useA= b*h+L(s1+s2+s3)
where b=13 cm
h=16 cm