Find the surface area of the equilateral triangular pyramid.
a) 180 cm2 b) 228 cm2 c) 268 cm2 d) 456 cm2

We know that
[surface area of the triangular pyramid]=area of the base+3*[area of lateral triangles]
area of the base=12*8/2> 48 cm²

area of one lateral triangle=12*10/2> 60 cm²
[surface area of the triangular pyramid]=48+3*[60]> 228 cm²

the answer is the option 
B) 228 cm2